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books on the rotary table ?

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ronan walsh25/06/2013 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 udall25/06/2013 02:31:12
2032 forum posts
41 photos
Cutting arcs...yeah thats pretty much wat they are for beyond the "dividing" function
NJH25/06/2013 07:54:53
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2314 forum posts
139 photos

You can, of course, get attachments for some tables to allow dividing. See HERE

John Stevenson25/06/2013 09:20:41
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5068 forum posts
3 photos

Go to this page on ARC's web site.

**LINK**

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 125/06/2013 09:41:11
2292 forum posts
159 photos

Hi Ronan,
You can use a rotary table to cut gears or drill a number of equaly spaced holes without dividing plates. Just divide 360 (The number of degrees in a circle.) by the number of teeth (Or holes) you want. For example if you wanted a 33 tooth gear 360/33 = 10.90909 Deg Most rotary tables are marked in degrees, minutes and seconds so you neet to convert the decimal value to this format.
So 0.90909 degreed is 60 * 0.90909 minutes = 54.5454 Then 0.5454 minutes is 0.5454 * 60 seconds = 32.724 seconds. You could use a spreadsheet to do the calculation and list all the table positions.
In the example you would cit the first tooth with the table set to 0 deg 0 min, 0 sec. for the second tooth move the table to 10 deg, 54 min, 33 sec (32.742 rounded to nearest second) For the third tooth set the table to 21 deg, 49 min, 5 sec. And so on. You are more likely to make errors using this method than dividing plates. Here is some information on rotary tables that you may find useful.

Les.

JasonB25/06/2013 10:01:37
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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

 

camhousing.jpg

Edited By JasonB on 25/06/2013 10:01:46

John McNamara25/06/2013 16:57:49
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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.

**LINK**

Just enter the number of degrees to divide.... 360 for gears but you can divide a smaller arc.
Also enter the nu,mber of divisions.
The sheet is smart enough to only show the settings needed, much easier to read. and smaller to print out and have by the machine to tick off.

Regards
John

Stub Mandrel25/06/2013 20:46:45
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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-

Cuitting large gear

Profile milling (also works for cams)

Valve face

Co-ordinate drilling, milling and shaping-

Four wheels ready to go...

More milling to shape-

Main Gear

ronan walsh25/06/2013 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 Stevenson25/06/2013 23:05:37
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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.

**LINK**

JasonB26/06/2013 07:26:16
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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

imag1508.jpg

imag1509.jpg

imag1510.jpg

Stub Mandrel26/06/2013 19:29:31
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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

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