30 Oct
2007
30 Oct
'07
9:38 p.m.
From: ard at p850ug1.demon.co.uk> > >
I've made just such a jig. I started with the frame of a SA400> > that I picked
up scrap. I then made two blocks of aluminum> > Thinking about it, the advantage of
the SA400 is that the upper part of > the index sensor, and thus the upper die block
after modification, is on > the clamp arm. Taht means the 2 die blocks are moved apart
when you > insert a disk.> > The disandvantage of the SA400 is that because the 2
die blocks would > move apart, they may not align again perfectly. And the other prolem
is > that the doors tend to reak if your'e not careful.
Hi Tony
The holes don't align with the with the door open but I find
that if I slide it through one block and the index hole on the disk,
things align nicely as the door closes. If I don't catch it,
the bit slides through all the way. A good indication that
it is aligned well. The SA400 uses metal bands for the hinge
and that keeps really good alignment.
> > I used drilled detents on the flywheel,
using a 10 hard sectored> > disk to index with.> > Having got a proper dviding
head (!), it would be very easy for me to > either drill holes or mill notches in the
pulley.
Yes, that is the other option.
In any case, it does work. I like the SA400 frame because it is
heavy enough to hold up to all the drilling and taping.
It could use a larger diameter flywheel.
Dwight
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