The Museum of HP Calculators

HP Forum Archive 17

[ Return to Index | Top of Index ]

Looking for HP97 printer gear
Message #1 Posted by Doug Braun on 28 Mar 2007, 11:40 p.m.

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

      
Re: Looking for HP97 printer gear
Message #2 Posted by Etienne Victoria on 29 Mar 2007, 2:12 a.m.,
in response to message #1 by Doug Braun

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

            
Re: Looking for HP97 printer gear
Message #3 Posted by marais on 29 Mar 2007, 3:04 a.m.,
in response to message #2 by Etienne Victoria

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

Andreas

                  
Re: Looking for HP97 printer gear
Message #4 Posted by Dia C. Tran on 29 Mar 2007, 9:44 a.m.,
in response to message #3 by marais

Can anyone sell me one of these gears predrilled?

                        
Re: Looking for HP97 printer gear
Message #5 Posted by Ignazio Cara (Italy) on 29 Mar 2007, 3:50 p.m.,
in response to message #4 by Dia C. Tran

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.

                  
Re: Looking for HP97 printer gear
Message #6 Posted by Etienne Victoria on 30 Mar 2007, 2:29 a.m.,
in response to message #3 by marais

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

                        
Re: Looking for HP97 printer gear
Message #7 Posted by Steve Borowsky on 30 Mar 2007, 6:56 p.m.,
in response to message #6 by Etienne Victoria

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?

                              
Re: Looking for HP97 printer gear
Message #8 Posted by Ignazio Cara (Italy) on 31 Mar 2007, 1:56 a.m.,
in response to message #7 by Steve Borowsky

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

                              
Re: Looking for HP97 printer gear, Ignazio is right!
Message #9 Posted by Etienne Victoria on 31 Mar 2007, 4:05 a.m.,
in response to message #7 by Steve Borowsky

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.

                                    
Re: Looking for HP97 printer gear, Ignazio is right!
Message #10 Posted by Dia C. Tran on 6 Apr 2007, 8:08 a.m.,
in response to message #9 by Etienne Victoria

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.

            
Re: Looking for HP97 printer gear
Message #11 Posted by Doug Braun on 6 Apr 2007, 9:30 p.m.,
in response to message #2 by Etienne Victoria

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


[ Return to Index | Top of Index ]

Go back to the main exhibit hall