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My Attempt
Stilldrillin:
Dave,
There`s no answer to that........ From me! ::)
The other Dave.
NickG:
Dave,
I've never sucessfully reamed anything either. Like you say, have tried both ways, leaving very little material and making it work much harder and can't get either right. Not sure whether it's speed, feed, lubrication or what.
Nick
Bernd:
--- Quote from: NickG on July 22, 2009, 09:28:45 AM ---Dave,
I've never sucessfully reamed anything either. Like you say, have tried both ways, leaving very little material and making it work much harder and can't get either right. Not sure whether it's speed, feed, lubrication or what.
Nick
--- End quote ---
Nick,
It's all three of those factors that you mention.
I usally manualy feed the reamer. So can't give you a feed rate. Speed should be slower than drilling and it also depends on the dia. of the reamer. I have noticed that lube plays a larger part in the finish you get. I've tried plain motor oil, "tap magic" (TM), motor oil and kerosene mixed. It also depends on the material that you are reaming.
Were I used to work we would leave about .010" to .015" (.25mm to .38mm) of stock on before reaming.
Bernd
Bluechip:
Bernd
I use Rocol RTD on mine, it's a fairly well known stuff for tapping & cutting. Certainly makes a difference screwing stainless, ( usually EN58, your '303 I think, not sure ).
But were you using machine reamers ? I have a 1/4" with straight flutes, this seems to be OK. I get on OK with FCMS ( Free Cutting Mild Steel ), but with brass or especially ally I get score marks or chatter marks, even with the same reamer. The reamers are mostly Intal or Dormer, so they aren't Asian tools, nor are they worn, some are as new. I usually ream at about 300 rpm, feed, I guess, at about 1" per 2 secs.
I have been using a lathe since 1971, always had problems with brass & ally. I've just about given up. I can't ream. I need to live with it.
Dave BC
Bluechip:
Hi troops
For those who like such things .. a movie ... and it now sports a flywheel about 20 psi most of it is leaking from the blow-down gun :scratch:
The brute in action ... kindly observe the strobe effect that my genius has contrived for your delight ::)
Dave BC
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