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Lagomorph Newbie
Joined: 26 Jul 2014 Posts: 9
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Posted: Fri Sep 09, 2016 1:22 am Post subject: Finished my modified Protoform table! |
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Here it is! It only took me a year and a half. I am a full time dad so chasing a toddler around takes most of my time and attention
Specs:
2 feet x 2 feet frame
25 ceramic elements
2 zone heat control
30 gallon tank
Gast pump
It months to tweak and tune and a professional electrician to help wire it up, but IT IS AWESOME! Pulls ABS, etc no problem. My only issue is heat (colder, wet climate) so I often have space heaters to keep the shop warmed up, otherwise it messes with my temperatures and timing.
Thanks for everyone's help on this forum, and if you're even thinking about it - go get those Protoform plans, so worth it!
Video below
https://youtu.be/EY2--jwu_jY |
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crashmann Guru
![](http://www.tk386.com/remotepix/TC-386-small-2a-stamped-lean.gif)
Joined: 27 Sep 2005 Posts: 501
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Posted: Sat Sep 10, 2016 7:31 pm Post subject: |
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Nice video and beautiful work on building the Protoform vac table!
Can you provide some additional information about the digital temperature controls for the ceramic heaters?
Charlie |
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Lagomorph Newbie
Joined: 26 Jul 2014 Posts: 9
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Posted: Sun Sep 11, 2016 11:42 pm Post subject: |
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Thanks Crashmann!
I'm using ceramic infra red E-mitters from Tempco
http://www.tempco.com/Infrared/Ceramic%20Emitter%20Style%20CRH.html
And this heat controller from RK instruments. I used 2 of them to control 2 zones.
http://www.rkcinst-usa.com/product/single_loop_PID_temperature_controllers.html
There's a couple big mercury contactors in mounted in industrial electrical boxes behind the table. Everything runs to buss bar type wiring up top above the table. I used high temp wire since the heat can still rise up and affect the wiring.
The upper element housing has (from the bottom to the top)
- ceramic elements
- upper tray (I had this waterjet cut from stainless steel as the ceramic heaters have these oval hot dog shaped mounting bases, and they use spring clips to hold them via the backside of the upper tray)
- above the tray I have a few strips of aluminum, with expanded steel on top, sandwiching a layer of high temp fiberglass / foil fabric (used for race car engine bays, and reflects 90% of the heat downwards), then the bus bars for the wiring, some more aluminum bars suspended above, then a vented dust cover on top).
I know this setup is probably overkill but I wanted the heat to be really consistent and not mess around with nichrome wire etc.
Hope that helps! |
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