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Looking for HP97 printer gear



#12

Hello,

I managed to successfully do the O-ring repair on my HP97's card reader, but two days later that plastic gear in the printer started falling apart.

Is that replacement gear still available from pic-design.com?
Is that still the best way to repair it, or is there some other source?

Thanks,

Doug


#13

Hello Doug,

I use one from GHW that I drill to adjust the center hole (see below).

Left: Broken gear, Middle: GHW gear, Right: drilled gear.

This works fine in my Hp-92 (daily use) and Hp-97.

More details on the procedure on Isabelle's site

Cheers

Etienne

Edited: 31 Mar 2007, 10:00 a.m. after one or more responses were posted


#14

Hi Etienne, how did you find the right drill for the job? GHW is a very recommended shop, I ordered five of these.

Andreas


#15

Can anyone sell me one of these gears predrilled?


#16

Hello, send me your address to ignaziocaraNOSPAM@tiscali.it, after removing NOSPAM, obviously. I will send you a predrilled gear for free.
Regards.

Edited: 29 Mar 2007, 3:52 p.m.

#17

Hi Andreas,

I put the gear on a Dremel 212 drilling table and use the ref. 628-1,6mm drill at 15000 rpm.

Then, to secure the gear on the printer, I put a rivet cap on the axis instead of the low quality breakable original Hp locking part.

I forgot to put a picture of the tool and rivet on Isabelle's site.

Kind regards from France.

Etienne


#18

Quote:
I put the gear on a Dremel 212 drilling table and use the ref. 628-1,6mm drill at 15000 rpm.

But, I thought it has to be drilled to 1,92mm?


#19

Quote:


But, I thought it has to be drilled to 1,92mm?



The gear must be drilled at 2,35-2,40 mm, IMO.

Ignazio

#20

Hi all,

Ignazio is right!

I refer to the GHW 753030 gear which is the one I've pictured. The inner diameter is already 2,00mm.

I have remeasured the original Hp gear from my 92 & 97s and it is indeed around 2,30.

All my apologies for posting an incorrect dimension. Isabelle's site has been corrected accordingly.

Thank you Ignazio.

Etienne


Edited: 31 Mar 2007, 4:11 a.m.


#21

I just received the gear from Ignazio and my calc now works beautifully. Thank you Ignazio, didn't know that you had to send it all the way from Italy.

#22

Thanks to everybody for all the advice. Before I saw your reply,
I ordered a couple of gears from SDP:

http://www.sdp-si.com/D790/PDF/D790C01036.pdf

They arrived in only a couple of days, and my printer is already fixed! Their gear is probably identical to the one that PIC-Design
sells. I had to trim one end, and use a 3/32"-to-1/8" sleeve.
For the sleeve, I used a bit of brass tubing that I got at
a hobby store. It was 3/32" ID and 1/8" OD, and it fit perfectly.

I also rebuilt my battery pack with the assembled cells from
Digi-Key.

Thanks again to hpmuseum.org and this forum for all the help!

Doug


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