[modeleng] Re: Boring Bearings
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 8 Sep 2005 09:05:07 -0700 (PDT)
Hubert, in Dave Gingery's booklet on making your own
small lathe, I think he solves this problem by boring
the seats for the bearings with the headstock mounted
on the bed by using a stiff boring bar. My memory is
not what it used to be, but our fellow poster, TEL in
Oz, has a copy of the book and can enlighten us on the
point
Al Messer
--- shep <shep.28@xxxxxxxxxxxx> wrote:
> 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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