10 Sector Hard sectored disks.

[dwight elvey]

> 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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