MRR is the volume of material removed per minute. Radial Chip Thinning Calculator This calculates the Feed Rate Adjusted for Radial Chip Thinning. To learn more, please refer to the cookie policy. I went to the Khari Baoli spice market in Delhi one summer evening, in search of pickles for myself and walnuts for a friend. D RPM. Just a bad thumb rule that makes your lathe a white elephant. To do it, you do not want a honed edge rounded off, as many inserts are supplied. Back draft is measured through the cutting edge base point and perpendicular to the direction of the work plane. The equation for the feed rate is: feed Rate = RPM * chip load * number of teeth. Depth of Cut (t): It is the total amount of metal removed per pass of the cutting tool. Please note that on a small diameter workpiece, machine R.P.M. In first step a length of (50 + 50) = 100 mm will be reduced from in 1020 if you take a cut under your tool radius lets say you use a 0.008 rad on the insert for a nice sweet finish you need a cut of at least 0.016 on diameter to get this finish, but i found out that you can take 0.0005 to 0.001 if you feed in reverse using the back of your tool radius and having the same nice finish and you meet the precision you want. If you're fortunate enough to take a tour of Alpine F1 Team's design and manufacturing facility in Enstone, Oxfordshire you can't fail to notice the number of high-performance 5-axis machining centres the Team has at its disposal.Those with eagle-eyes will also notice that a significant number of these machines are advanced Mikron 5-axis . Legend: D - Workpiece diameter at machining point (in inches) DOC - Depth of cut (in inches) rad - nose radius of insert (in inches) SURFACE FEET PER MINUTE (SFM) REVOLUTIONS PER MINUTE (RPM) )4F-D dRf; bz bB{I!q}b@1).-Yr >;6g$nx`pN uy1;Z['7z42WsfEYLA9edAGf?_$NOv.0b The Latest Innovations That Are Driving The Vehicle Industry Forward. The actual surface quality depends on additional factors such as stability and cutting edge wear. However, if the plural cutters are 180 degrees away then dividing the depth of cut (DOC) formula by 2 will give you a more accurate generalization. Cutting Speed 3. endobj Slotting: An application in which the tool's entire cutter diameter is engaging a part. Material Removal Rate = Depth of Cut x Cutting Speed (SFM) x Feed Rate (Dist./Rev.). . An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. Machine tools are limited by spindle power, and their R.P.M.. stream Depth of cut, during turning operations, is also a function of the cutting rate. They identify your unique browser and Internet device and may be used to provide anonymized demographic data, build profiles of your interests, and display advertising relevant to those interests. What is the depth of cut on a lathe? Radial depth of cut (mm) (inch) Tool center feed (mm/min) (inch/min) Feed per tooth (mm) (inch) Thread milling with a roll into cut tool path, Dvf1 Formulas for external thread milling Calculated version Tapping Formulas and Definitions Formulas for hole size A basic hole size calculation can be made with the following formulas. All Rights reserved. Answer (1 of 4): where , f = feed (in mm/ rev ) where Cs = side cutting edge angle Alternatively, when nose radius is significant as compared to depth of cut, the former one becomes predominant in influencing surface roughness. These cookies are used to analyze and improve the functionality of this website. at Davg. By dividing the full cutting depth of the thread into smaller cuts, the sensitive nose radius of the insert is not overloaded. Inches Per Minute CPT x Z x RPM = IPM. Cutting speed. Pc (kW) : Actual Cutting Power With sharp tooling we bore holes to the same tolerances using a flood of cutting oil. PCD-tipped grooving-type inserts are applied. VT^n = C. 80 (T)^0.09 = 144.2. Feed, Speed, and Depth of Cut Feed rate is defined as the distance the tool travels during one revolution of the part. mm . To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. E.g., in rough turning well always use a depth of cut of 3 mm. (On the left) Broad tool, but not taking it very deep: If you're machining a work-hardening material, the minimum depth of cut becomes critical. Some materials like Stainless will form a work hardened layer that can be difficult to penetrate with HSS tooling. So the unit of the total material removal rate is the mm^3/min. CPT Z RPM. <> (Answer) Substitute the specific cutting force Kc=3100MPa into the formula. The step well after which its named was used for animals and for bathing, and got covered up sometime in the past 350 years. Expirement - material, machine rigidity, coolant and a host of other things will affect which way works best. Why is depth of cut important to machining? Its not even a issue taking less than half a thou in stainless. Posted on October 11, 2021 by sansmachining. They are both measured perpendicular to the table feed direction. x+T0373 D&{&++ Depth to feed tool when cutting American threads National coarse and fine Footnotes 1. Calculate the required total machining time T with the following cutting conditions: Cutting speed V=80 m/min , Feed is f=0.8 mm/rev , Depth of cut = 3 mm per pass. Khari baoli means the well of salt water. To use this online calculator for Uncut chip thickness, enter Feed (Fcutter) & Side Cutting Edge Angle (s) and hit the calculate button. Here is how the Machining Time for Turning Operation calculation can be explained with given input values -> 0.011368 = 0.01/ (0.0007*20.9439510228654). Also referred to as Stepover, Cut Width, or XY. M f (mm/rev) : Feed per Revolution ap (mm) : Depth of Cut For example, these cookies allow you to share pages from this website with your social network. Cutting speed 2. Recommended cutting speeds are from 1,000 to 1,300 sfm. In a lathe machine, the depth of cut is shown as follows: If the depth of cut is larger, then it specifies a greater MRR (Material Removal Rate). 2) The cutting force depends on the chip load, which is proportional to the cutting depth. If chatter marks or machine noise develops, reduce the depth of cut. Pc= (30.21203100) (601030.8)=4.65 (kW) Kc Page Top For different operations, the definition of surface may vary. 2 0 obj C = 144.2. Mathematically, it is half of difference of diameters. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Most turning operations are efficiently performed within a lead angle range of 10 to 30 . DEPTH OF CUT - (DOC) NUMBER OF EFFECTIVE FLUTES RADIAL CHIP THINNING FACTOR TRUE TOOL DIAMETER CORRECTED RPM ADJUSTED FEED RATE (IPT) CORRECT TABLE FEED (IPM) ROUND INSERT & BALL NOSE CUTTER SURFACE FINISHES ****SURFACE FINISHES ARE THEORETICAL AND GIVEN IN Ra VALUES - RMS = Ra x 1.11**** TO FIND: RESULTING SURFACE FINISH IN Ra W: Width of cut, mm. is also depend on how you take the cut. CADEM CAPSturn CNC lathe programming software takes insert max. Formula. By the way, speaking of spice, at one end of Khari Baoli road is GB Road, Delhis biggest red light area, also in existence since Mughal times. How do you find the depth of a cut in turn? Its a street full of shops selling spices, pickles and dry fruits. Surface Feet Per Minute SFM = .262 x D x RPM. {6W4 With a 3/8 inch seam allowance . These cookies enable this website to provide enhanced functionality and personalisation. endobj It is usually given in the third perpendicular direction (velocity, feed and depth of cut usually act in mutually perpendicular directions). Lathe Machine Formula For Cutting Speed, Feed And Depth Of Cut The following are the lathe machine formula commonly used to calculate in turning operations: 1, Cutting speed 2, Feed 3, Depth of cut 4, Machining time 1, Cutting Speed The cutting speed v of a tool is the speed at which the metal is removed by the tool from the work piece, In a . Mathematically, it is half of difference of diameters. Named after Garstin Bastion, a British Collector of the time (by the way, Garstin, could you have ever guessed what they were going to name after you ?). If for instance a bit is designed where 2 cutters are in the same radial position or a plural set then this formula cannot be used. depth of cut into consideration and helps you reduce cycle time. To enter a value, click inside the boxes containing the "Enter" prompts. ",#(7),01444'9=82. Cut from right to left, adjusting the depth of cut by moving the cross feed handle and reading the calibrated collar located on the cross feed handle. The higher your cutting parameters, the higher the MRR. Turning Operations D O D f d d D O = Original Diameter D f = Final Diameter d = Depth of Cut 3 d = Do - Df 2 . Then for the depth, you use this formula (d/2). Turning Example Data: v = 125 SFPM; f = 0.0015 in/ rev D o AISI/SAE/ASTM Designation. Material Removal Rate Formula for Milling When milling we calculate MRR as: Material Removal Rate = Radial Depth of Cut x Axial Depth of Cut x Feed Rate. above), at one time has now reduced to about 5 types for health reasons. xYKo7q9| EGqUrc+>Xj9<>cWtzy~lx$B s =?x4}wc3~Zn {f+6BX)t`,[[Lk.f_#PLZA1m,>=>UgO~+;XnUm'_(: w/Sz&jBn} dKjayY%p, wr4(06.#$h@l FLQvrfMNBuh/2M*#ErO8R5;/|LZ4 sfht! I always work on the assumption that the smallest depth of cut I can take when turning is about 0.1mm (~ 5 thou). Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. Depth of cut (t)The tertiary cutting motion that provides necessary depth of material that is required to remove by machining. Please note that on a small diameter workpiece, machine R.P.M. This is more material related than anything else, when you have material prone to this you have to leave more. For most of the aluminum alloys, the roughness cut, i.e., 0.01-0.03 in cut depth runs at a feed rate of 0.005-0.02 IPM or inches per minute. With a dead sharp tool Hss tool, that's ground, then diamond lapped to 1200 grit diamond and accurately on centre you can take any depth cut you can measure. Now we can find tool life at a speed of 80 m/min. Also, if you cannot get under the scaled (harder) layer of parts that have been heat treated, you'll do little more than rub the workpiece against your cutting tool until failure results, usually at the expense of a new tool. Depth of Cut Depth of chip taken by cutting tool and one-half total amount removed from workpiece in one cut Only one roughing and one finishing cut -Roughing cut should be deep as possible to reduce diameter to within .030 to .040 in. Cutting parameters include cutting speed, back-cutting amount, and feed rate. *M`BG`EBqH)ieG#lCSeB5ieFGQ7X8O4WG!Cm]MNLuIYv(w_Ju$=zODQS)lT "#J*K!\ rO Ny{^RX#a>_. The depth of the cut is calculated in inches or in millimeters (mm). 'j',]YVD* u;!U:%`w-B5|64qXB9:)45`*#;=>F2jfCk.Cga.npp(i@Xl.4glQ?c0.rR"D}%RSisAxP N*$c24XLNj71z36MqeVTg)Os_W\C`,]wfpVX9knJKLT>(Z&jiEjEM>Uz5|XSEj4 GIa2.G>AE{]G@~b#Kc6wg| This table shows the max. Formula for Turning Formula for Turning Cutting Speed (vc) Check the item you want to calculate, input values in the two boxes, and then press the Calculate button. It can vary and depending upon the type of tool and work material. If you live in Delhi, lucky you ! f (mm/rev . Cutting speed V C = 800 sfm (244 m/min.) Feet/Minute. Cutting Calculation App . endobj Offsetting the Tailstock On materials like 12L14, B1113, or 6061T6 I routinely take .0001" or .0002" cuts with my Sheldon lathe. For large cut depths larger the side relief angles may be needed to avoid tool seizure. Nobody knows. The depth of cut (t) is the perpendicular distance measured from the machined surface to the uncut surface of the workpiece. Material. %PDF-1.5 MRR = Axial Depth of Cut * Radial Depth of Cut * Feed Rate (all values in inches or inches per minute for Feed Rate) This formula yields the number of cubic inches per minute your cutting tool is removing. Divide by 1000 to change to m from mm. The pickle collection in my home (about 15 types pic. Maximum depth of cut in rough turning, based on turning insert shapes We decide the depth of cut on the basis of an arbitrary thumb rule. n: (Machine Coefficient). Some materials cause false cutting edge buildup easily. They may be set by us or by third party providers. Cutting Forces of Lathe 2. JavaScript is disabled. Feed depth with compound at 30 = sec30x (single depth of thread) {=1.1547x (0.6495/N) or 0.75/N} 35 years ago my boss told me .003" for a finish cut. = 1.775. The reason is that the MRR is directly proportional to the cutting speed, feed rate and DOC (depth of cut). Why not 4, 5 or 6 ? It can vary and depending upon the type of tool and work material. (0.76 to 1 mm) of size required -Finishing cut should not be less than .005 in. How do you calculate turning forces for cutting? Cultures can be seen to function identity-wise like a beehive with legions . Material specific energy 0.33 hp*min/in3 an aluminum alloy at 400 RPM; = 10.00, u = 0.5 Rake angle, Find Davg. Turning speeds are adjusted to the feed rate of the mini lathe (0.004/rev. Depth of Cut (t): It is the total amount of metal removed per pass of the cutting tool. Okuma makes the most common machine for this operation. SOLUTION : V=80 m/min f=0.8 mm/rev The turning will be done in 2 steps. Similarly, the finishing cut, i.e., 0.002-0.012 in cut depth runs at a feed rate of 0.002-0.004 IPM or inches per minute. The depth of the cut and the feed rate will also affect the cutting speed, but not to as great an extent as the work hardness. How to Market Your Business with Webinars? A cut is to be taken with a (HSS) turning tool on a 0.75 inch piece of 1045 steel with a brinnel hardness of 300. Material removal rate formula for milling D: Depth of cut, mm. The Radial depth of cut (AE or RDOC), is the length that the tool engages a workpiece perpendicular to its axis direction and the Axial depth of cut (AP or ADOC), is the length in its axis direction. Kc (MPa) : Specific Cutting Force Cutting Calculation (Turning) Recommended browsers Chrome, Edge, Firefox, Safari. or .613 divided by the number of threads per inch +.005 thousanths = the depth to plunge the grooving tool into the thread diameter to make a thread relief (based on a .001 move on the crossfeed dial makes a .001 move into the part, or removes .002 on the diameter). Formula for Turning Divide by 1000 to change to m from mm. Feed 3. http://img.photobucket.com/albums/v337/johnoder/PWChips.jpg, Single Point CNC Threading an Arbor for a Boring Head, Thread experts - Calculating Minor Diameter Limits of EXTERNAL thread, End mill as a slitting saw, practical smallest diameter. For example, they provide login retention functionality. Turning Equations Rotational Speed: N (RPM's) . For example, for drilling, it is the speed at which the drill bit travels down into the workpiece material. False cutting edge buildup on tool tip can act as if tool is bigger and when buildup breaks off it will act as if tool is smaller. Construction. General machine practice is to use a depth of cut up to five times the rate of feed, such as rough cutting stainless steel using a feed of 0.020 inches per revolution and a depth of cut of 0.100 inch. It is expressed in mm. Peripheral Milling: An application in which only a percentage of the tool's cutter diameter is engaging a part. If youre a pickle lover and are visiting Delhi, pack in a small trip to Khari Baoli. }.UOa;\nz[8"moJna'[hA,DM[nYvzM3| q> RFMD7,\DBON80'AVhRq"Wie64 Kr|`Z? This website or its third-party tools process personal data (e.g. The solution will appear in the box on the right side of the equation. If it isn't sharp, it will cut a little, then skate a little. You just have to keep it cutting not let it rub, but so long as the tool is sharp that is not a issue. % Common feeds for "beauty face" are from 0.004 to 0.006 ipr. Also an amazing variety of pickles. A rougher can get edge build up that alternates between building up and cutting under then letting go and cutting to size. Good Luck. Cutting speed and feed determines the surface finish, power requirements, and material removal rate. It is a simple and affordable CAD/CAM software. Cutting speeds are expressed in feet per minute (imperial) or meters per minute (metric). In this article we will discuss about:- 1. The angle should be reduced as the depth of cut increases on larger diameter work-pieces to around 5 degrees, to avoid tool deflection. This is often seen when a cut is repeated without changing any readings if you see chips still being made. For a better experience, please enable JavaScript in your browser before proceeding. Step five cut off any excess fabric and turn your bag right side out. Just a bad thumb rule that makes your lathe a white elephant. You actually sneeze a lot, because of the spices floating around in the air. Turning Problems. feed the tool bit by hand-turning the compound rest feed handle in a clockwise direction. 1 0 obj What is the formula for depth of cut? The depth of cut (DOC) formula can be used to generalize this bit. Feet/Minute. Machining time 1. Table 4 shows the preset values of the dependent feed rate and the depth of cut depending on the type of . T = 587.31 min. The technology behind the technology in front!. <> Carbide. Being a Sheldon doesn't hurt. (10% off), Ad vertisement from shop CuirFilEtCouleur, Ad vertisement from shop AllSewnUpbyHannah, Ad vertisement from shop DesertBohemiaVintage, $20.00 Looks like you already have an account! Such volume is based on the area of a circular ring of a cylinder and its length of cut. When it comes to machining time calculation, the formula is as follows: Machining Time = Length of Cut (mm) / Feed (mm per revolution) x Revolutions Per Minute Revolutions Per Minute = 1,000 x Cutting Speed (mm per minute) / x Diameter of Rod (mm) Depending on the project, you may need to replace millimeters with inches. . Any thoughts greatly appreciated. Example: By taking 0.23-0.10 mm (0.009-0.004 inch) in cutting depth per pass (radial infeed), the full cutting depth ( a p ), and the profile depth of the thread (0.94 mm (0.037 inch)), is turned on a 1.5 mm (0.06 . I have followed this as a general rule in precision production even today. 1. Necessary cookies are used to help this website function properly. Here is how the Uncut chip thickness calculation can be explained with given input values -> 0.517638 = 0.002*cos (1.3089969389955). In drilling and milling, the surface is the outside diameter of the tool. Axial Depth of Cut (ADOC): The distance a tool engages a workpiece along its centerline. Now here's the last piece: The machining time spent roughing your workpiece is mostly determined by Material Removal Rate. Explanation: Depth of cut is equal to half the diameter of the drill used. Turning is the basic method of machining, which at the same time well characterizes the generally understood cutting process. This calculates the Metal Removal Rate given the Width Of Cut, Depth Of Cut and Inches Per Minute. Calcuate SFM. We use cookies to ensure that we give you the best experience on our website. I had another boss get mad if you did not wipe the oil of a pin guage before gauging a hole becase the oil left in the hole would cause the boring bar to deflect. It is expressed in mm. Of course it you use modern coated carbide inserts you will have an easier time getting partially through a work hardened layer and usually have less false cutting edge buildup as carbide SFPM speeds. <> Analytical cookies collect information about your use of this website in an anonymous and aggregated form. if you have a small lathe and a thin and long part and tooling sticking out too far all will deflect or spring some amount. It can vary and depending upon the type of tool and work material. Characteristics of the material being cut, chip flow depends on material type and feed rate Depth of cut Depth of Cut It is the total amount of metal removed per pass of the cutting tool. endobj Lock the carriage to the lathe bed when the tool bit is in position. and d is the depth of cut which has also a unit of mm (in.) The constant technological progress causes changes in the selection of the values of the machining parameters. Free machining plain carbon steels (resulfurized) 1212, 1213, 1215. Solid End Mills / Exchangeable Head End Mills, Cutting Power for Face Milling (each Cutter), Effects of Cutting Conditions for Turning, Function of Each Cutting Edge Angle in Face Milling, Lead Angle (KAPR) and Cutting Characteristics, Available database of cutting tools (ISO 13399 compliance), Wear Resistant Tools / Rock Tools / Carbide Blanks. How to calculate Uncut chip thickness using this online calculator? Current formula (1) for metal removal rate (Q) when turning is based on the cutting speed (V c ), depth of cut (a p ), and feed rate (f): (Formula 1) Q = 12 V c a p f (in 3 / min) There is another approach that defines volume of the chips to be removed. Here's a little-known fact about inserts. endstream A place worth seeing even if youre not a fan of any of these. Through CNC machining of customized parts, we often hear the three terms of cutting speed, depth of cut, and feed rate. ), a depth of cut of 0.040, and a tool life of 180 minutes. Depth of cut = (D d ) /2 mm where D = dia of job in mm, and d = finished dia in mm (in single cut) Machining Time In lathe work, if the speed of job, feed of tool and the length of job are given, we can calculate the machining time by the following formula Machining Time for a Complete Cut minute = l / (s * n) Minutes Material Removal Rate Formula for Grinding When grinding we calculate MRR as: Depth of cut refers to the width of the metal layer that is sheared off from the workpiece during machining. You want the edge as sharp as possible, which will be sharper with HSS because carbide tends to flake. However, for the sake of estimating surface roughness in machining, when tool nose radius is very small as compared to depth of cut, it is considered as a sharp tool. F: Feed rate, mm/min MRR = (D x W x F / 1000) cc/min. Single depth of thread = 0.6495/N where N is threads per inch For N=8, Single depth=0.6495/8=0.0812 2. 6 Why is depth of cut important to machining? vc (m/min) : Cutting Speed may not be fast enough to allow the appropriate depth of cut. 2018 by CADEM Technologies Pvt Ltd. Bengaluru, India, 2020 by CADEM Technologies Pvt Ltd. Bengaluru, India, Insert selection based on insert geometry at the cutting edge, CNC lathe work holding thumb rules for quick decisions, G76 Fanuc threading cycle, and depth of cut in CNC threading, CNC machining cost how to reduce it, with zero extra investment, CNC turning chips shape and size, and ROI, CNC spindle power usage how to maximize it and increase profits, ROI, CNC threading insert partial vs. full form, Insert nose radius and radial force in CNC turning, Turning insert shapes, and properties of different shapes, CNC machine monitoring system and capital cost, Cutting speed formula in CNC turning, milling, CNC Turning reducing radial cutting force, ISO turning insert nomenclature simplified, Helical vs. Straight end mills CNC milling. CNC program and machine movement what actually happens . A 45- to 55-hp machine tool's maximum spindle speed is 3,000 rpm. Calculate the required total machining time T with the following cutting conditions: Cutting speed V=80 m/min, Feed is f=0.8 mm/rev, Depth of cut = 3 mm per pass. If you continue to use this site we will assume that you are happy with it. Smallest depth of cut depends on what your cutting, the cutting tool your using and the machine your cutting it on. Calculating the power requirement P using U P and mrr is the conventional method. Depth of Cut 5. The calculated distance which is perpendicular between the uncut surface and the machined surface of the workpiece is taken. Substitute the specific cutting force Kc=3100MPa into the formula. Pc=(30.21203100)(601030.8)=4.65(kW) Kc Technical Info / Cutting Formula Heres more info on the place : http://en.wikipedia.org/wiki/Khari_Baoli. For different processing methods, different cutting parameters need to be selected. Feed 4. To use this online calculator for Machining Time for Turning Operation, enter Length Of Cut (L), Feed Rate (f) & Angular Velocity of Job or Workpiece (N) and hit the calculate button. It all depends. 4 0 obj It works fairly well under most circumstances. I grind on both brazed carbide and HSS tools using the radius of the wheel to make a concave face on the front of the tool, then finish it off with a fine diamond lap laying across the edge and bottom of the radius which keeps me from rocking it and rounding the edge. In roughing operations, doubling the depth of cut halves the cutting time, enables you to use the machines spindle motor better, increases your profits. Radial Depth of Cut (RDOC): The distance a tool is stepping over into a workpiece. Rapid moves are not in this calculator as they are usually . 5 0 obj depth of cut for various insert shapes. Circular tools require an end cutting edge angle relief, usually between 10 and 15 degrees. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation. 4 What is cutting speed feed and depth of cut? In lathe cross slide is used to give depth of cut. The depth of cut (t) is the perpendicular distance measured from the machined surface to the uncut surface of the workpiece. endobj The midpoint of a segment in n-dimensional space whose endpoints are = (,, ,) and = (,, ,) is given by +. In a lathe machine, the depth of cut is shown as follows: Where, d1 - diameter of the workpiece surface before machining. Kc Values (Cutting) Machining Formula Collection Index Machining Formula Collection Face Milling Formulas The formula below will give you the single depth for undertaking unified threads: d = P x 0.750 Where d = Single Depth P = Pitch n = Number of threads per inch (TPI) Infeed Depth = .75 / n Thread Calculations To cut a correct thread on the lathe, it is necessary first to make calculations so that the thread will have proper dimensions. (0.127 mm) 47-12 So friends in this article you have to know what is tool life, what is Taylor's tool life equation, what are factors affecting the tool life, and also know how to calculate tool life with an example. Why not 4, 5 or 6 ? (1) Press keys for depth of the thread eg 1.534 (2) Press divide key () then press the key (3)Enter the number then press 10 then press = 1.534 10 = 0.4854 This is the value to enter for D D.485 So Easy You Can Do it Backwards So your cycle reads G76 D.485 K1.534 X16.93 Z-25. 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