2 Apr
2010
2 Apr
'10
2:40 p.m.
Hi Chuck
I've had good results using the shank of a #93 drill.
I use this both for the alignment of the index and
punch for the other holes.
The H89 did seem a little fussy about the timing
between the index hole and the others. In that case,
it was clear on a scope that I was way off.
Since then, with careful setting to my indexed
marks, I don't see any problems. My current setup
just uses a single hole punch and block. It requires
me to rotate the disk ( a possible source of error ).
What I'm thinking of is all 11 holes pre-drilled.
This should be much easier to use. I'd be clamping
from the center so even disk in envelopes could
be punched or one could go with bare disk. In the
case of those in envelopes, one could rotate the
envelope around.
In that case that one want to make it faster, one
could add solenoids at each punch location and do
them all at once, with a bare disk. I think that most
would find that punching one at a time is no problem.
Still if anyone has a copy of any of the versions
of X3.163, I'd love to see it.
Dwight
From: cclist at sydex.com
On 2 Apr 2010 at 14:03, dwight elvey wrote:
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Hi
I'm starting to make some mechanical drawing for
some 11 hole punch blocks that could be used for
any combination of auto or manual punching.
There is an ANSI spec, X3.163, that I'd like to
look at. The cheapest I've seen is $22 and I don't
want to put out that much for a few simple dimensions.
The one I have the most question on is envelope
thickness. For the 5.25 disk I've already figured
most of the rest ( or at least what I believe them
to be).
This is what I have so far:
Spindle hole 1.125 dia
index hole 0.10 dia
index relative to center of disk 1.00 radius
Spindle relief hole 1.5 dia
Thickness of complete disk ( not counting folds at edges ) about .070
In my experience, the hole size isn't as important as the placement
of the leading edge. Index/sector pulse widths vary by drive
manufacturer, so the trailing edge isn't used (by anyone that I know
of).
For whatever it's worth.
--Chuck