[GreenKeys] Model 32/33 Teletype P/N: 180502 Print Hammer Head Dra wings

[Don Robert House]

The hammer heads were not domed... they were flat.

I must have changed 100's of them... Teletype did not use a good  
rubber... they would melt in the little white expandable file  
envelopes in our trucks.

I should tell you about my order of those envelopes.  I should have  
saved one... they are all in the parts cabinet in San Diego.
Anyway I put in an order for 1,000 parts envelopes for our crew and  
shop.  One day a semi pulled up to our garage and the driver and helper
wanted to know "Where do you want these 10,000 envelopes?"  The wire  
chief's clerk had added a zero to my order.
We were giving cases of those envelopes to all the Teletype shops in  
Illinois and Indiana with lots left over.

I still have the parts cabinet from my TTY repair truck.  Somewhere I  
have slides showing the interior with all 50 BSP binders.
Had Ozite carpeting, air compressor, work table, 115Vac inverter spare  
M28, M35, and M33 Typing units. Test equipment and
an IMTS mobile telephone... but a tiny heater and NO A/C. I also  
installed an AM-FM radio.

Don


On 27 Feb 2014, at 9:30 PM, airrelic at juno.com wrote:

Don, was the sample you sent to Dave W5DT flat on the top, and not  
domed? I have attached the drawing of the head I received from Paul  
Cembura and his was domed. Other than that they seem identical.

Kevin


Please note: forwarded message attached

From: David Tumey <davetumey at yahoo.com>
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Model 32/33 Teletype P/N: 180502 Print Hammer  
Head Drawings
Date: Thu, 27 Feb 2014 13:35:46 -0800 (PST)

Finally after a few small setbacks, I have completed the SolidWorks  
drawing for the 180502 Print Hammer Head.  Special thanks to Don House  
and Wayne Durkee for helping me get sample parts to measure.  Don  
literally ripped a print hammer out of his machine and mailed it to me  
as the only teletypes I have access to are in Dayton OH with my son.   
Special thanks to Dr. Tony Xu for creating the drawing for me!

Attached are the following files (all dimensions in mm):  180502.pdf,  
180502.eprt (which can be viewed with the free eDrawings viewer found  
here: http://www.edrawingsviewer.com/), 180502.sldprt (which can be  
converted to an .stl file for 3D printing).

We have tried the part on our 3D printer with limited success.  (1) It  
does not really have an original look, and (2) I doubt it will wear as  
well as an original part.  Because of these limitation, I have decided  
to go all-in and have an injection mold tooled up for the part.  I  
have two quotes in process.  I am planning on shooting the part with a  
black 70 Shore A Thermoplastic Elastomer (TPE) material.  Once I have  
some samples, Wayne has volunteered to test them in use, and after we  
confirm the correct material selection, I will shoot between 2,000 and  
10,000 pcs.  I will circle back with the Greenkeys once I have  
finished parts in hand.  I am estimating 8-10 weeks to machine the  
tooling and 4 weeks to vet the parts.

As I mentioned, the part can be made on a 3D printer with the above  
SolidWorks drawing.  If you would like to try this, I recommend the  
following filament:  https://www.matterhackers.com/store/3d-printer-filament/175mm-black-tpe-threequarter-kg 
.  We use a Cubify Cube 2 but my engineer tells me this will work with  
the Makerbot Replicator 2 printer as well.

I will keep you posted on my progress.

73's
--dave
W5DT


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