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Reaming a pinion, wall thickness?

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pgrbff02/09/2011 12:05:54
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Will do but have to order reamer and bits from UK, so will be a while before I get started.
Thanks for all your help.
JasonB02/09/2011 12:16:04
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You should open it upto 5.8 as said, the risk of reaming it from anything smaller can make the reamer cut oversize.
 
Just about any hand reamer you buy will be whats called an H7 tollerance which will fit your shaft just fine. The advantqage of a hand reamer is that it has a tapered end so will easily follow the existing hole. Definately do not get a 6.1mm reamer.
 
One point not mentioned is you should not reverese the lateh or turn the reamer backwards when withdrawing it, again that may make it cut oversize.
 
Oh and you have seen that picture, I snipped it from the video you posted about the motor mounting bracket.
 
J
pgrbff02/09/2011 17:31:23
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I have ordered a Hertel reamer and 5.8mm Hertel jobber bit.
One thing I had not considered in any detail that has come back to bite me is how am I going to hold the pinion in the lathe?
I currently only have 2 options, a quality 3 jaw (vice?), and imperial 5C collets.
The OD of the pinion is 11.5mm.
Any answers that are economical appreciated.
 Would a 12mm 5C collet work? I don't want to damage the gear.
edit again, I have found an inexpensive 11.5mm 5C collet, I assume that would be OK or is there a better route? 

Edited By pgrbff on 02/09/2011 17:34:01

Edited By pgrbff on 02/09/2011 17:38:26

JasonB02/09/2011 17:44:12
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5C should only be used for their exact size.
 
Back at the beginning of this thread as an option to using a collet I suggested a "split bush" and thats likely to be your best bet as due to the teeth on the pinion a chuck may not grip truely.
 
A spilt bush is easy to make, get a bit of alloy bar a few mm larger dia than the pinion say 16-18mm dia and face of fa length about 20mm long. Hold it lightly in the lathe 3 jaw and drill then bore out to a snug fit on the pinion, mark one chuck jaw and the bush were it touches the jaw. Remove bush from lathe, split the bush with a hacksaw opposite the mark and de burr.
 
Put teh pinion in the bush and grip the bush with the marks aligned, you will then have a good true hold of the pinion with no risk of damaging the teeth.
 
Its easier to do than explain, if you want a pic of a bush let me know.
 
J
pgrbff02/09/2011 17:51:56
261 forum posts
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No I get the idea.
You may not have seen the edit, I can get a 5C 11.5mm collet. I understand the collet fits into a Hardinge ? holder?. Would that be as good as the split bush?
I can see an aluminium split bush would be soft and grip well.
 
JasonB02/09/2011 18:10:38
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If the collet is not expensive then go for it. If you have a bit of aluminium laying about making the bush would be good practice for when you come to make the adaptor and probably cheaper than the 5C which you may never use again
 
Edit
 
Has your friend got an 11/16" collet thats probably withing the tightening range of 11.5mm, may save a few quid.
 
J

Edited By JasonB on 02/09/2011 18:21:12

pgrbff02/09/2011 18:27:39
261 forum posts
31 photos
He has all the 16ths, but not many 32nds. Is 7/16 or 11.11mm close enough? The 11.5mm is £7 inc post, I may just bite the bullet.
I hope I won't have to do too much more shopping for this, its getting expensive!
Clive Hartland02/09/2011 18:56:34
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Expensive! Join the club. I have built up tools over 40 years and I still need other types of cutters and collets. Its never ending and when I look at my Sockets and spanners that I have had to buy over the years for different cars its amazing.
Drills should be a one time buy in a set and you can buy extra sizes as time goes on.
Taps and dies are another expense which sometimes are cheaper by the set!
Enjoy what you are doing and do not worry too much about it as most times it will all work out well.
 
Clive
JasonB02/09/2011 20:00:21
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Actually the 7/16" may be pushing it a bit so go for the 11.5mm
 
J
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