How to use a divide head and rotary table. Measure the OD, ID and bolt pattern. I paid a lot more than that for my L-W dividing head! The latest industry news—straight to your inbox. Remember that it is entirely possible to use any of several hole plate series to achieve the same result and that the hole series resulting in the closest whole number should always be preferable for use for the most accurate and precise angular movement. While it won't tell you how to use a dividing hd, you'll want to get copies of that info while you learn how to use your dividing head. (we will come back to the pointers later in this paper). Show Printable Version; 04-05-2005, 12:23 AM … I paid a lot more than that for my L-W dividing head! Sign up for our eNewsletter now to stay in-the-know. While I have, by now, a general idea how it works, and some math background that is enough to figure out the basics, I would like to learn a little more about the intricacies of using a dividing head. Simple or Plain Indexing: Of course both devices may be mounted then moved in multiple orientations besides that mentioned above in order to produce the profile required. It is always worth the time to work out the number of handle turns (t) as this will provide a guide of the handle movement to expect from the calculation, this number should be used also at the end of the equation to verify the result (rule). http://www.lindsaybks.com/bks/mmindx/index.html, http://www.amazon.com/Wheel-Pinion-C...2245410&sr=1-1, http://www.amazon.com/Gears-Gear-Cut...ref=pd_sim_b_1, http://www.youtube.com/watch?v=VHTXaU7GZC0, http://www.homemetalshopclub.org/new...v96.html#gears, http://www.littlemachineshop.com/ins...otaryTable.pdf. We must now find out which series of holes will exactly match the angular movement that we need. We will now calculate the hole series to use to produce 21 divisions on a diameter. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. Some cheaper devices are fitted with only a graduated dial for rotational movement, but for perfect precision the machinist must make use of the 'Hole Plate', which is an integral part of most 'older' or better quality dividing heads and rotary tables. The axis handle has both a sprung pin - which may be inserted into one of the holes as well as a set of âclock handsâ and pointers that aid repetitive movements. (I know this sounds complicated but hopefully the example below will clear the method up a bit - if you have problems with the calculation then try our on-line hole plate calculator). The ratio of turns between the device handle and the chuck (or table) is always 40:1, so 40 turns of the device handle would give 1 complete turn of the chuck. This process may seem at first to be somewhat 'trial and error', but after repeating the process several times the engineer will gain enough experience to be able to make an educated guess at the likely hole series to use. Next we must work out the total number of holes on each series that are on the hole plate. Continue this procedure until the machining operations are complete about the full 360 degree movement. Most dividers are fitted with a set of 'clock hands', or pointers that are designed to aid quick location of the handle pin into a hole in the hole plate. One should also bear in mind that it is entirely possible that several hole plate series may be used to produce a given angular movement. 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. This is an online calculator to calculate what indexing plate to use and number of holes to skip for a given number of divisions. (t) Calculate the number of handle turns to check final result. For example: using a 21 series hole plate, we know that we need 40 holes. Center a plate in your chuck,turn the chuck up 90 degrees and bolt it to a good drill press with a small center drill, find a clean spot on a plate and make holes. I may have some plates that will fit. ie, 120.009 would be a better selection than 120.01). Kenny. This calculator can be used for both rotary tables and indexing heads. This is done by dividing the total number of holes on a given hole series by 360 degrees. The divide head is similar to that of mounting a lathe head on a milling machine table to produce a horizontal rotating axis, where as a rotary table is more commonly used to rotate the work piece vertically. The figure should equal the number of handle turns calculated above. These numbers are to be used to quickly identify if the degree of chuck movement to produce the desired division can be achieved on one set of drilled holes. Learn more about us. The hole plate is a static circular plate mounted to the rear of the rotation handle which is pre-drilled with many equally spaced holes at a different series of pitches. This website or its third-party tools process personal data (e.g. This can be found by gently rotating the centre cover until a screw head can be seen through a small inspection hole drilled into the cover. Perform the machining operation at this position then move the clock hands as a complete unit (both hands are now locked together via the locking screw) so that the second hand now touches the rear of the handle pin. It is important to remember to continue the rotational movements in the same direction about the entire machining operation. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. We'll bring you the most relevant peer-to-peer conversations happening in the trade and tips and tricks to help you get the job done. Movement of the device is a simple matter of rotating a handle in the desired direction until the degree of movement is obtained that you need to rotate the part. You are a lucky fellow! You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. So, set the first pointer against the front of the handle pin - then move the second pointer 2 holes anti-clockwise about the plate and secure the locking screw. (remember that all dividing heads are at 40:1 ratio so you need to turn the handle 40 times to produce 360 degrees of movement at the chuck). The divide head and rotary table are a device used to rotate the work piece around a third machine axis, this is usually referred to as the 'C' axis and is commonly used on milling machines or borers to provide the ability to easily create accurate single or multiple machining operations around a component. Be sure to check the machine manuals forum here for L-W dividing hd info I posted in there a long time ago (with some help from Barry Weeks ;) ). This type indexing is most commonly used for indexing fixture. Center a plate in your chuck,turn the chuck up 90 degrees and bolt it to a good drill press with a small center drill, find a clean spot on a plate and make holes. This means that one rotation of the handle would produce 9 degrees of chuck movement. This result must then be further divided by the result of our first calculation, which in this case is 51.42857. ie, for 37 hole series - 1480 must be inserted into the equation, or for 21 hole series, 840 should be used. In simple use, the engineer would mark-off the work piece prior to mounting onto the 'C' axis, then having mounted a centre drill or pointer into the machine chuck - rotate the part until the markings align central to the spindle. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Move the handle clockwise so that the handle pin is against the rear of the first pointer (one full rotation and nineteen holes - 21 holes + 19 holes = 40 holes). Next divide the result between 40 turns of the handle to give the number of turns per division. This way any backlash in the mechanism of the rotaty axis will not effect the finished product. I have bought a "LW Chuck Co" dividing head, complete with a tailstock, for $50 at a liquidation auction. © 2020 Copyright Practicalmachinist.com. The intermediate use of worm and worm-wheel is avoided. Measure the OD, ID and bolt pattern. Marked on your device hole plate will be number that corresponds to the numbers of holes are drilled on a certain area of the hole plate. Give it a try by clicking on the 'calculators' link. The index plate has 24 holes and the periphery of job can be divided into 2, 3, 4, 6, 8 and 12 equal parts directly. Our on-line calculator can help the hole plate selection process, all you need is to know the series of holes that you have available on your hole plate. Results 1 to 11 of 11 Thread: How to use a dividing head. The ratio below describes how many turns of the handle makes the table rotate one full revolution. The purpose of this final calculation is to obtain a resulting whole number by applying different total holes per series into the calculation. (n2) Insert total number of holes of different series of hole plates. To learn more, please refer to the cookie policy. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. A typical use would be to quickly machine a hexagon profile around a diameter, or to produce a series of cut-outs at a specific pitch from one another. Of course this method is only as accurate as ones marking-off and sight allows! http://www.lindsaybks.com/bks/mmindx/index.html, http://www.amazon.com/Wheel-Pinion-C...2245410&sr=1-1, http://www.amazon.com/Gears-Gear-Cut...ref=pd_sim_b_1, http://www.youtube.com/watch?v=VHTXaU7GZC0, http://www.homemetalshopclub.org/new...v96.html#gears, http://www.littlemachineshop.com/ins...otaryTable.pdf, Fabrication: CNC Laser, Waterjet, Plasma, Welding & Fab, Schaublin, Cazeneuve, Weiler, Graziano, Mori Seiki Lathes, Cincinnati Milacron, Kearney Trecker, VN, USA Heavy Iron, Machine Reconditioning, Scraping and Inspection, Tooling, Parts and Accessories For Sale or Wanted, Machinery Manual, Brochure and Photo Archives. So, for a series of 19 holes - this would be: 19 holes X 40 turns = 760 holes per 360 degrees of rotation of the chuck.
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