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bogstandard:
Very easily explained.

Hand reamers when you can't get it on a machine to ream the hole.

OR

You've only got hand reamers in the size you want to use.


Bogs

raynerd:
Ahh! - so since the majority of the work I have done could have been done by machine really I should be going down the route of purchasing and using machine reamers. Cheers
Chris


--- Quote from: bogstandard on August 02, 2009, 05:22:53 PM ---Very easily explained.

Hand reamers when you can't get it on a machine to ream the hole.

OR

You've only got hand reamers in the size you want to use.


Bogs

--- End quote ---

Bluechip:
Hi Bogs & others ..

I think the light may have come on .. Just been miking some reamers I have ..

The hand reamers seem to have about 1" of lead on them. The 1/2" one does anyway. So ...
If it has 6 cutting edges, I have circa 6" length of cut on. Not a lot of depth, but I would expect an awful amount of chatter if I did it on the lathe. I would not dream of attempting it. But, in effect, that's what I do using a Hand Reamer in the tailstock chuck.

The 1/4" reamer with straight flutes appears to have virtually no lead at all. It's difficult to measure in practice.
This is OK.
Maybe that's the reason? If it is why didn't I think of that 38 years ago ?

I have one very ancient 1MT 11/32" reamer. Got it with the Myford. Never used it 'cos never wanted a 11/32" hole. But, it reams brass beautifully. What a b*gger.

It looks about worn out too, maybe Stew's theory about dubbed edges is right too.

Tracy Tools will get an order tomorrow ..


Live and learn ..

Dave

EDIT 2 MT 11/32" !

Darren:
Here's my modest collection of reamers

top four are hand reamers and the bottom one is a machine reamer. With an old bush on it to protect the flutes.



The machine reamer is an adjustable type with a tapered screw in the end. I have used this one a lot. made about a hundred or so replacement bushes for record players.



To use I simply drill the hole in the brass (I have used leaded PB1 and aluminum brass) and run this through at around 600rpm holding it in the tailstock. It's 31/64 or just under half inch.

Never had a moments bother with it, it just does.... :dremel:

I used this type because every bush, or I should say the shafting was slightly different in size and close tolerances were the order of the day.

Bernd:
Also reramers do not cut on the side flutes. The small chamfer on the end of the reamer does all the cutting.

Also NEVER EVER run a reamer backwards in the work. You'll ruin it.

These are my 2 cents worth of info on this thread.  :coffee:

So far from what I've all read you guys are doing quite good in sorting out all the tricks with reamers. For those with a chattering problem, I've heard and read that a lard, such as Crisco is good to use for a lube. Really don't know as I've never tried it.

Bernd

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