Posted by TheOldHokie on February 02, 2013 at 14:03:20 from (74.110.76.253):
In Reply to: 9N oil pump bushing posted by russb wa on February 02, 2013 at 11:22:26:
russb wa said: (quoted from post at 15:22:26 02/02/13) I had forgotten about the split bushing, which I would still consider reaming on a lathe with a collet chuck. No setup, just a tool change.
One of the best tool for my 9x20 lathe modified lathe kit from the land of almost right, was my ER32 collets and chuck, opened up the lathe possibilities, rechucking etc. With accuracy to 0.0004 (four ten thousandths), hold fragile tubing tightly with out crushing, no slippage. So good, I got a chuck for the mill, use the same collets. ER32, collets are cut with 16 contraction slots giving each collet a range of about 1/16" hence Extreme Range. 12 collet set will reach down below 1/8 up to 13/16. Brilla Precision Tools, BPT. But they are not cheap.
I still wonder about the squareness of the setup on the mill. You must have set the main cap in the vise with parallels. I guess you can run the tip of the indicator down the inside of the bush housing to check square. Also, deflection from the over hang, but it might not be significant with such a light cut.
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I'm using a 10HP/8500# Cincinnati horizontal mill with an optional 2HP Toolmaster vertical head mounted on the overarm. The head has an NMTB 40 spindle running on extremely high precision bearings inside a 4" quill. The reamer is chucked in the spindle using a top of the line Devlig/Universal Engineering Accuflex collet chuck and my work piece is solidly anchored to the stationary table with a 100# machine vise.
You are holding the work piece in an ER32 collet chuck mounted in the MT3 headstock spindle of your 250# Grizzly/Enco/HF 9x20 lathe. I presume you intend to mount the 8" long reamer in the 1" MT2 tailstock quill on the lathe and feed it horizontally into the spindle with the hand wheel.
And you are worried my clamping setup may be susceptible to deflections from a 2" overhang on the work piece?
TOH
This post was edited by TheOldHokie at 15:02:25 02/02/13 3 times.
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