Hi Bob:
I've never seen a bb lathe but I understand that there seems to be
some small quality changes that make it somewhat better than the
usual 7 x 12. In fact I remember someone saying they had metal
change gears...
Here's a web site that has two basic programs that tabulate gear
strings for different threads including metric. One is Visual Basic
but the one I use is the old qbasic version. Both do the same thing.
It tells you the % error too. The program shows an error of .06% for
the two most common gear strings for .75mm. You can play with these
and see the effect on accuracy of having a 21 tooth gear.
http:www.cctrap.com/~varmint/alath.htm
I've made many changes on my lathe mostly for fun...It worked perfect
right out of the box.
Mike in Cranbrook B.C.
--- In 7x12minilathe@..., "sawadeee2 <bomo@s...>"
<bomo@s...> wrote:
Hi folks,
I've been flirting with the idea of a benchtop lathe for some time,
and it would be used mostly for photo/telescope adapters and parts.
Most of these do-hickies max out at about 2.5" diam. and a few
inches
long, and many would be threaded at .75mm pitch, various diameters.
Here in Canada, BusyBee is the equivalent to Grizzly et. al. Same
machines, different label. So....these are a couple of things I'm
wondering about:
What is the largest diameter stock I can chuck into the chuck? 3"?
2"?
I know the thread range is something like .05 - 2.0 mm, but what
are
the steps? Or to cut to the chase; can I cut .75mm threads?
On a more general level, how do you folks find the quality of the
small lathes? Is a lot of tweaking and modifying required, or do
they
work quite well out of the box?
Thanks,
Bob
