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Plain ol Bill
03-05-2004, 12:54 PM
I need to ream some 1/4" & 3/16" holes. Bought the reamers from MSC and don't want to ruin them. Are reamers a fast or slow tool?

Al Flipo
03-05-2004, 01:06 PM
Keep the speed moderately low, use lots of good quality cutting fluid and keep it clean.

Al Messer
03-05-2004, 01:07 PM
Very slow----in the lathe--bottom back gear, with LOTS of cutting oil/lubricant. Withdraw often and flush away the chips.

timf
03-05-2004, 01:52 PM
http://www.pahltool.com/tech/reamerspeedfeed.htm

this link has a chart for reamer speeds and feeds.

should get you started

SGW
03-05-2004, 02:09 PM
Also...never turn a reamer backwards.

I generally try to leave about 0.005" to 0.010" for the reamer to take out and run reamers around 200 rpm.

Paul Gauthier
03-05-2004, 06:04 PM
When I ream I use an RPM 1/2 or less of drill RPM.

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Paul G.

pgmrdan
03-05-2004, 06:29 PM
Make sure you read the first sentence in SGW's reply.

yorgatron
03-05-2004, 06:35 PM
slow? uh-oh...

bspooh
03-05-2004, 08:19 PM
Personally, I always use the same RPM as the drill, but twice the feed...This is in a semi-production workplace...good results


brent

Thrud
03-05-2004, 08:33 PM
NEVER TURN THEM BACKWARDS!!!! http://bbs.homeshopmachinist.net//eek.gif

ALWAYS USE A SPIRAL REAMER IF A SLOT IS INVOLVED

Farmer Joe
03-06-2004, 12:09 AM
What happens???

chkz
03-06-2004, 12:29 AM
spiral reamers are great for thru holes but they can push chips forward so for a blind hole I'd try 'n use a straight one....

JCHannum
03-06-2004, 12:43 AM
Spiral reamers are made for reaming holes with a keyway or other interruption. The spiral prevents the reamer from jamming in the slot.
Reamers are ground to cut in one direction only. Turning them backwards will dull the cutting edge right now.
If reaming a blind hole, withdraw and clear the chips frequently. Otherwise, you will have a poor finish or a hole with a broken reamer in it.
Don't throw your reamers all together in a drawer, but store them individually in the sleeves they came in.

sinbad
03-06-2004, 02:42 AM
A rule of thumb from school 1/2 the speed and twice the feed of comperable size drill.