On 2008-08-06, Terry Coombs wrote:
DoN. Nichols wrote:
On 2008-08-05, Terry Coombs wrote:
DoN. Nichols wrote:

[ ... ]

3" wide sounds good for a 16" long one. You might even get away
with 2-1/2" wide (perhaps you'll wind up there after finishing the
bar, depending on how rough it is now. :-)


snipped a whole bunch of stuff ...

Good!

My unit is based on an angle iron about 30" long , top is 2 3/4 wide ,
vert is two inches . It's 3/16" thick . It hangs from the back side of the
ways on two blocks (one on each end) machined for a snug fit over the back
flat way . Clamp blocks on the bottom hold them in place , alignment is from
the fit . Pictures ... so easy with photos , but right now I have nowhere .
Anyway , there will be a 3.5" wide by 1/4 thick flat guide bar (just cut
it from a piece of bigass angle I had) pivoted near the center , with an
adjuster screw arrangement on the tailstock end and clamps on both ends .
The guide block that rides on this and guides the crossfeed will be about 4"
wide , for plenty of surface area . Thinking about it , I'm going to set it
up so it can be pivoted either at 10" or 12" from the adjuster screw
centerline . With a 20 tpi adjuster screw , each turn will be .100" total
taper , pivot position will determine thousandths/inch or inches/foot . I
have a scrap handwheel with a dial with a hundred divisions ...
Once I finish , I will post pics and a text file in the dropbox . Turns
out almost all the material has been from scrap I had on hand . A few bolts
and one small piece of mild steel is all I've needed to buy so far .

Sounds like an interesting design.

I look forward to a link to the photos when you are done.

Good Luck,
DoN.

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