HP 46/81 idler gear

[RPZ]

Hello Duane,

Good to hear from you.

These are the measurements I picked up from the forum to print gears.

I did not print the hub on the 97 gear thinking that it would be easier to see wear and if there was some I could flip it around and use it again. They seem to be working well. Once designed it’s just a matter of pushing a button and using about 3 cents worth of material.

I was a little bit unsure following the 46/81 thread as to the thickness. Perhaps you could verify as you have one that works.

HP 97 Gear Parameters

30 teeth
80 pitch = pitch diameter
20 = pressure angle
0.100” = gear face thickness
0.078” = hub thickness
0.250” = hub diameter
0.125” = bore

HP 46/81 Large Gear Parameters

68 = teeth
0.4 = module
20 = pressure angle
1.256mm = circular pitch = mm per tooth
2.500mm = gear face width
3.200mm = bore

HP 46/81 Small Gear Parameters

17 = teeth
0.400 = module
20 = pressure angle
1.256mm = circular pitch = mm per tooth
2.500mm = gear face width
3.200mm = bore

I got lucky a while back and found a whole box of new cards at a great price and am in good shape. Thanks. I am just curious if a printed gear will work and if you are willing to test that would be great.

Along those lines, I have spent a lot of time trying to clean and reuse cards. The ones marked with sharpie did not clean with alcohol or any other solvent I had on hand. Even tried spray painting and sanding. Sorta worked but always a bit thicker and decided not to risk damage to my rebuilt card readers.

Pencil should be no problem right? None of my erasers worked. Finally bought a Tombow Sand Eraser 512A and it works well. Very fine abrasive and if I am careful, removes pencil without rubbing thru to the black underneath.

If you can verify the gear thickness, pm me an address and I will try to mail some gears in the next week or two.

Regards, Rick