Herstellen von Hartsektorierten Disketten

I will cut it smaller and attach it to the drive clamp frame of the drive, in the position of the original sector hole sensor.

The arbor there is just a test, I shall make a raised S shape part with a hole in for it to punch against, to replace the plastic sensor holder.

Phil

Top section of the punch, in place.

Showing the action.

Phil

Made an arbor, with a hole drilled through and filed to a sharp 90° edge.

Test with thin card yields holes that are not bad, but could use improvement. I am going to change the shape of the cutting edge (I made this one by filing the rod flat with my angle grinder).

Philip

I cut the blade to include a switchback. Now it cuts more cleanly around the circumference of the blade.

Test again with card.

Phil

Quote from mister-freeze

Gehe ich richtig in der Annahme, dass das Indexloch der 10-Sektor Disks wie bei den 16-Sektor Disketten genau mittig zwischen den Sektorlöchern ist ?

Sorry für die späte Antwort, aber ich wollte sicherheitshalber noch mal einen Blick auf die Diskette werfen.

Das 11. Indexloch ist tatsächlich genau in der Mitte zwischen zwei Sektorlöchern.

...and if it is not, FLUXCOPY will write, but not read the first sector.

Not a bad start but more care is required. I need a bigger wheel to turn the disk spindle with, I just marked the drive pulley with 16 lines.

Nice Job!

We should merge the two solutions together!

The shape and the edges of your cutting tool look sharp as hell 👍

Quote from Aquarius

Nice Job!

We should merge the two solutions together!

The shape and the edges of your cutting tool look sharp as hell 👍

I may file it again so that the cutting edge is symmetrical, as office paper hole punches are.

That metal is very hard, it used to be a 7/32" (2,77mm) drill bit.

Philip

Quote from mister-freeze

But probably this has no effect on the result, as long as the holes have the same distance. (Whereby I just ask myself which pulse edge of the /index pulse is actually used by a disk controller and which influence has the pulse length, i.e. the hole size?)

I think, it is allways the start of the hole (FLUXCOPY uses allways the falling edge of index pulse on the shugart interface). The length of the pulse has normaly no effect, when it is not too long.

PAW

Typography error! Please do correct me when I am wrong.

5/32" not 7/32"

I didn't have anything metric in stock, so that was the closest to 2,5mm that I had.

Quote from PhilA

5/32" not 7/32"

I didn't have anything metric in stock, so that was the closest to 2,5mm that I had.

Hi Phil,

I think 5/32" = 3.9mm is much too big!

It may be a problem, when the holes are to big, because the distance between the holes (especially around the track index) is to short. May be that the sensor does not work correctly, when the "dark" time between two holes is to short.

3/32" = 2,4mm may be good.

PAW

Yes, 7/64". I knew there was a 7 in there somewhere.

My excuse: not feeling very well after having had my vaccination the other day.

Phil