ronan walsh | 25/06/2013 01:21:44 |
546 forum posts 32 photos | Are there any books on the rotary table ? I know there are several on the dividing head but information on the rotary table seems to be scarce. When i was serving my time we done a fair amount of work on the dividing head, what it could do, the maths involved etc, when i asked about the rotary table i was told that in production situations and general commercial engineering that cnc had made them nearly obsolete. A friend gave me an old table a year or two back and i have amused myself cutting arcs etc on bits of scrap, but i feel there is a gap in my knowledge of the thing. |
jason udall | 25/06/2013 02:31:12 |
2032 forum posts 41 photos | Cutting arcs...yeah thats pretty much wat they are for beyond the "dividing" function |
NJH | 25/06/2013 07:54:53 |
![]() 2314 forum posts 139 photos | You can, of course, get attachments for some tables to allow dividing. See HERE
|
John Stevenson | 25/06/2013 09:20:41 |
![]() 5068 forum posts 3 photos | Go to this page on ARC's web site.
Scroll down until you find the first rotary table advert and just above the price list is a clickable link to download a free guide.
John S. |
Les Jones 1 | 25/06/2013 09:41:11 |
2292 forum posts 159 photos |
Hi Ronan, Les. |
JasonB | 25/06/2013 10:01:37 |
![]() 25215 forum posts 3105 photos 1 articles | You can also use tham for non regular spacings such as a series of radial holes and tangental surfaces. The part below was done with the R?T vertical then rotated for the two angled faces and the four different angles for the holes then laid on its back for the curves all of which radiate from the same centre point
Edited By JasonB on 25/06/2013 10:01:46 |
John McNamara | 25/06/2013 16:57:49 |
![]() 1377 forum posts 133 photos | Hi All Below is a link to a spreadsheet I made up to calculate divisions using a rotary table in degrees or degrees minutes and seconds.
Just enter the number of degrees to divide.... 360 for gears but you can divide a smaller arc.
Regards
|
Stub Mandrel | 25/06/2013 20:46:45 |
![]() 4318 forum posts 291 photos 1 articles | I do loads of jobs on my (home made) rotary table as its much more rigid than my (home made) dividing head. The handle is graduated to 1/10 of a degree and I find that accurate enough. Any technique that works with a dividing head can be applied to a rotary table, if you add dividing plates to the handle. Neil Examples of rotary table tasks: Gear cutting- Profile milling (also works for cams) Co-ordinate drilling, milling and shaping- More milling to shape- |
ronan walsh | 25/06/2013 22:45:00 |
546 forum posts 32 photos | Thanks for the replies and links everyone, the rotary table is just something i have never seemed to use somehow. I have one now and just wondered how to do some of the trickier work, cam milling for instance ? |
John Stevenson | 25/06/2013 23:05:37 |
![]() 5068 forum posts 3 photos | If you mean cam milling as in IC engines then you need to map out the lift at say every degree.
Take a look at this link.
|
JasonB | 26/06/2013 07:26:16 |
![]() 25215 forum posts 3105 photos 1 articles |
Posted by John Stevenson on 25/06/2013 23:05:37:
If you mean cam milling as in IC engines then you need to map out the lift at say every degree.
That rather depends on the cam cutting method, you can do it without the calculations if its a short cam. With the R/T laid flat and the work held in a 3 jaw just wind the handle in approx increments, no fine setting of the cutter for every increment |
Stub Mandrel | 26/06/2013 19:29:31 |
![]() 4318 forum posts 291 photos 1 articles | Call me dense Jason,. buty how does that give you anything but a completely random cam profile? Neil |
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
Sign up to our newsletter and get a free digital issue.
You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.