[modeleng] Boring Bearings
- From: "shep" <shep.28@xxxxxxxxxxxx>
- To: "Modeleng" <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 8 Sep 2005 11:13:22 +0100
As mentioned in my message to Al Messer, I am slowly making a small, heavy,
hopefully precision, screwutting lathe from large lumps of solid cast iron.
The centre height will be about 2". I have finished the bed, (with
'dovetail' ways) and had this precision ground, and have almost finished the
cross and top slides.
I am now planning the construction of the headstock, also machined from the
solid. The mandrel will be 20mm in diameter, supported by two opposed taper
roller bearings of 42mm diameter. I am perplexed how to bore the seatings for
these bearings. I have a 5" centre height Emco lathe and a horizontal
milling machine.
I thought of clamping the roughed-out headstock onto the vees of the bed, and
clamping the lathe bed onto the bed of the milling machine, checking the
squareness with a dial gauge. It should then be possible to drill and then
bore the seating for the bearing, using a boring head. Difficult, but
possible! My problem is how to bore the bearing seating on the other end of
the headstock, whilst ensuring accurate alignment with the first seating?
I hope that I make myself clear. Any practical advice would be greatly
appreciated.
Cheers! Hubert Elffers
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