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Old 11th Aug 2009, 2:13 pm   #1
JimMac53
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Default chassis holding fixture

Has anyone come up with a chassis holding fixture? Some of the sets I've worked on require me to stand on my head for access to some part. I was thinking of making some kind of holding fixture, but it seems it would have to be tailor made for that particular chassis.
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Old 11th Aug 2009, 2:26 pm   #2
Colin
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Default Re: chassis holding fixture

Hi Jim, I've come across a number of designs for chassis jigs in various early books on radio servicing. They're all adjustable to accommodate different sizes of chassis and simple to construct. I'll try to dig them out and post on here.
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Old 11th Aug 2009, 2:27 pm   #3
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Default Re: chassis holding fixture

Fantastic!
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Old 11th Aug 2009, 4:05 pm   #4
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Default Re: chassis holding fixture

Worth taking a look at the service data for Philips 745A
Page 9 ( fig. 8 ) shows the Philips thinking on an adjustable jig.
I'm sure this could be made to accomodate most chassis.
The only time it falls down is if there are no threaded holes in the base of the chassis to attach it to the jig

I sent the plans to Gerry some years back to see if he would consider fabricating it for a decent sum, but never received a reply.

I guess if there was enough demand, a small engineering firm may take on the task. Personally I would have paid almost anything to acquire something similar a couple of years back when my servicing activity peaked. I fear the moment has passed....
It's surprising what you can effect with some stout copper tube and a pipe bender !!


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Old 11th Aug 2009, 4:17 pm   #5
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Default Re: chassis holding fixture

Andy,
Could you post the page?
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Old 11th Aug 2009, 4:33 pm   #6
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Default Re: chassis holding fixture

It's amazing what can be achieved with a stout cardboard box of suitable size. Turn chassis upside down, and drop valves and sticky outy bits "into" the box, resting the edges of chassis on the edges of box. It's worked for me! If you need to turn some knobs simply cut holes or slots in the box for the shafts.
Of course you need to keep an infinate number of different size boxes, but it's amazing what you can find in an emergency
Sometimes the chassis will stand in the case and be supported that way.
How about some pieces of Dexion(C) or similar?
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Old 11th Aug 2009, 4:48 pm   #7
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Default Re: chassis holding fixture

I'm sure we had a thread on this a few years ago. Can't find it though.
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Old 11th Aug 2009, 6:13 pm   #8
Colin
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Default Re: chassis holding fixture

I've scanned a couple of examples. Apologies for the poor quality of the pictures but they do illustrate the kind of thing used for this work. The first is an adjustable jig made from metal strips and tubing with lots of wing nuts! The second is a different approach using adjustable 'chassis jacks'.

I like the cardboard box approach but if you've a little more time and some simple tools something along these lines shouldn't be too difficult to knock up.

Personally I keep a few offcuts of 2" by 2" section wood handy and can prop up each corner of a chassis with a piece to provide a level work area.
Attached Files
File Type: pdf Chassis Servicing Jacks.pdf (402.6 KB, 193 views)
File Type: pdf Chassis Servicing Rack1.pdf (755.4 KB, 186 views)
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Old 11th Aug 2009, 9:43 pm   #9
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Default Re: chassis holding fixture

Mods - Hope this is OK ?? A.
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File Type: doc chassis jig .doc (62.0 KB, 186 views)
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Old 11th Aug 2009, 10:24 pm   #10
AlanBeckett
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Default Re: chassis holding fixture

Andy,
I can see the idea behind it, but it looks a bit flimsy for a heavy chassis. Are there any dimensions in the text?
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Old 11th Aug 2009, 11:39 pm   #11
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Lightbulb Re: chassis holding fixture



How about a wooden framework, made of 33mm. X 33mm. PSE, rectangular in all three planes and held together with wooden dowels that friction-fit into various holes drilled in the framework, thus making this frame adjustable in size (3 dimensions) to accomodate different sizes of chassis?

Rigid, versatile, easy to make & cheap. Plus, since it is made of wood, minimal electrical safety hazard!

Al. / Skywave
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Old 12th Aug 2009, 6:17 pm   #12
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Default Re: chassis holding fixture

All good ideas. I think I like the servicing rack, which would allow easy maneuvering from the top side to the bottom side, but each have there advantages. I'll have one of each, please.
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Old 12th Aug 2009, 10:56 pm   #13
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Default Re: chassis holding fixture

Quote:
Originally Posted by AlanBeckett View Post
Andy,
Are there any dimensions in the text?
Alan
Alan, alas there are none shown anywhere .... Andy
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Old 17th Aug 2009, 10:14 am   #14
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Default Re: chassis holding fixture

I have a plain wooden baseboard (about 2-3" thick, drilled in a regular pattern and two sets of wooden dowels, one set long and the other shorter, both for upside down work only.

A quick check and measure for dowel locations to fit between valve bases and other encumbrances then the chassis can be lowered onto them upside down. It is firmly supported, saves a lot of mucking about, and if the serviceman's gods are with me I can use the shorter dowels on the side closest to me and longer for the far side and have a tilted chassis to work on.

It is of minimum cost, takes little skill, few tools and no time to make, fits all chassis sizes and types and packs away in very little space. Being non-metallic it doesn't present any shock hazards either.

Cheers

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