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Indexing head

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carl

02-09-2003 07:36:46




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I need to get a quantity of shafts splined. None of the local shops have an indexing head for their mill,but volunteered a low rate if I brought a indexing head for them to use. What can I expect to spend for a new or if available,used one? Where is a good place to look? i'll be splining 1.75" with 31 splines. THANKS!




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Bob

02-09-2003 17:33:19




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 Re: indexing head in reply to carl, 02-09-2003 07:36:46  
I'd check with a shop that resplines axles. 31 spline is a real common in the Ford 9" rearends, but not sure what the diameter is. Not knowing a lot about machining, what does an indexer do, just provide the correct number of degrees between where each spline is cut?



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Jet9N

02-09-2003 14:51:02




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 Re: indexing head in reply to carl, 02-09-2003 07:36:46  
Do have a large number of shafts? Otherwise have you checked with someone like Hub City or some other
gear company? They have a large selection of this
type of product.

HTH

Jet



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Irv

02-09-2003 12:32:42




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 Re: indexing head in reply to carl, 02-09-2003 07:36:46  
Depending on the quanity, It would be far cheaper to find a gear co. to do this for you. It would involve a setup fee & a per piece cost. You would need a true dividing head. I am not sure but I have never seen a index head with 31 positions - most do 2,4,6,8,12 maybe a 3? A dividing head can do whatever. Good luck. Irv



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Jet9N

02-09-2003 14:47:45




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 Re: Re: indexing head in reply to Irv, 02-09-2003 12:32:42  
Just a point of information. To do oddball indexes
you use compound indexing. This a combination of two different circles.

Jet



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Irv

02-10-2003 07:29:26




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 Re: Re: Re: indexing head in reply to Jet9N, 02-09-2003 14:47:45  
Yeah - I am a tool & diemaker - but i have been in an ispection job for 25 years - probably shows lol. Irv



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Bob

02-09-2003 09:09:46




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 Re: indexing head in reply to carl, 02-09-2003 07:36:46  
Check out enco.com, or look for a used one one ebay.



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Kraig WY

02-09-2003 08:14:42




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 Re: indexing head in reply to carl, 02-09-2003 07:36:46  
A good one is gonna cost in excess of $500. Then you need to make sure they can do the set up. Most are pretty common. You might find it would be cheaper to seen the part to a machine shop that has one.

I have use a milling attachment for a lathe, ( that ratates a full 360 degrees for an indexer on a milling machine. I've made gears, using it and a fly cutter ground to match the teeth of the gear. Also have flutted rifle barrels using the milling attachment. Its all in the planning and setup.

For one piece it would be cheeper to find a place and send it out.

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Ray,IN

02-09-2003 19:37:26




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 Re: Re: indexing head in reply to Kraig WY, 02-09-2003 08:14:42  
I agree wholeheartedly with Kraig WY. The work obtained from the indexing head can be no better that the quality of the head itself. I would follow his advice and look up "machine shops" in the yellow pages of the nearby large cities.



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jeff

02-09-2003 20:22:26




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 Re: Re: Re: indexing head in reply to Ray,IN, 02-09-2003 19:37:26  
I was acquainted with a fellow machinist a long while back that encountered a similar problem. Low number of parts that needed splining externally and no dividing head. His solution was cheap and effective as it worked. It was for re-splining some shortened axle shafts for the drag racers. His method involved locating a chain sprocket with the same number of teeth as was required on the axle shafts. He fabricated a way of supporting the axle shaft and also fabricated a way of securely attaching the sprocket to the axle itself. Then using another fabricated fixture that used a round pin that would tightly fit in the sprocket "valleys", he would cut the splines to the required depth (mounted horizontally on a mill table), remove the round pin, rotate the axle 1 sprocket tooth, use that pin to locate the axle, tighten everything down again and commence to cutting. This worked well and the axle fit the differential gears just fine. I'll admit this was crude, but it's hard to argue with it since it worked. I'd be leery of it in extremely close tolerance work, but on an axle shaft the tolerance might allow for a little error. I'd bet (based on Carl's description) he's narrowing a Ford 9" rear as they had 31 splines and 28 spline axle shafts. Regardless, BE CAREFUL! Hope this helps.

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Tom

02-10-2003 16:49:00




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 Re: Re: Re: Re: indexing head in reply to jeff, 02-09-2003 20:22:26  
If you use a sprocket or gear that is somewhat larger in diameter than the work the error will be reduced, that is if there is any noticable error in the sprocket, or gear, and the jig. I would think this method would work fine, was going to suggest it, but you beat me to it.



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