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Blueprinting your brush hoods


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#1 swodem

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Posted 10 December 2016 - 12:36 AM

It's raining today and I was looking for a project to do.
 
Our annual remits this year for FK class included the option to change the (generally very) average PS4002FK hardware over to the better copper kits that are available but sadly this was defeated by democratic vote (you know, the same process that got your President elected).
 
So I have resigned to simply blueprinting them.
 
I had a go with the Backtrack tool but it really lacks the strength to do more than just line it up if it doesn't require bending, but much of the problem to me also seems to be the loose fit of the brushes so it really needs reshaping.
 
This requires some tooling but custom making something would be expensive if you don't have your own tool shop.
 
Eventually I utilised the following I had lying around.

  • JDS C-Can Bushing And Endbell Alignment Tool - JDS-5002
  • JK C-Can Blueprinting Tool - JK-BPTool
  • Koford Brush Hood Alignment Tool - KOF-M148

I used an old endbell clamped in place as a template to drill the JDS can tool, and carefully tapped the holes with the actual screws I was going to use from the endbell (use oil to lube and make sure holes are deep enough)

e622e490b77ac2048d38b11559897fdd.jpg

dd02c91d6bb75bf4c1d47625378fb39e.jpg
 
Once assembled it needed a .7mm shim (feeler gauge) to support it and 10mm of spacers at the back. The 2mm shaft is an interference fit so can be tapped so as not to protrude out the back.

8297426b145ef7c16a80605b76b603ba.jpg
 
Now, I can panel beat these into about as good as they will ever be, and it's fully legal adjustment.
 
Turns out I was glad it rained today...


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#2 Zippity

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Posted 10 December 2016 - 02:10 AM

I thought everybody had one of those tools.
 
Well done. :)

#3 swodem

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Posted 10 December 2016 - 03:34 AM

Post the pic of yours, Zip.

#4 Zippity

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Posted 10 December 2016 - 03:38 AM

Camera broke...

#5 swodem

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Posted 10 December 2016 - 03:40 AM

Whatever, mine are all pics off my phone.
 
Sure you can do the same.

#6 havlicek

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Posted 10 December 2016 - 10:05 AM

Very nice, Steve!  

 

Two other things about this hardware and endbell.  

 

The hoods themselves have very little "bearing length" relative to the length of the brushes themselves. That makes a good fit between the brushes and hoods even more important, since under the lateral force exerted by the spinning comm against the brush faces, the brushes can deflect sideways and wear crooked. What you're doing would definitely help that.  

 

The other thing about these is that the pocket the bushing sits in is awfully shallow and not a particularly tight fit to the bushing. The bushing can spin or even fall out (in cases where "the rulezz" don't preclude taking the endbell off).  

 

In any case, very cool work!

 

-john


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John Havlicek

#7 Zippity

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Posted 10 December 2016 - 04:34 PM

Steve,

 

I wasn't saying that I had one of those tools (although I do have all the parts), but rather, what a brilliant idea.  :)

 

Zip



#8 gotboostedvr6

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Posted 24 February 2017 - 02:50 PM

Brilliant, Steve.


Those who work for a living are being quickly overwhelmed by those who vote for a living.

Thomas Jefferson: "Paper is poverty. It is only the ghost of money, and not money itself."
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#9 Kevin Donovan

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Posted 25 February 2017 - 10:58 AM

Does anyone sell this tool yet?

#10 Fast Freddie

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Posted 25 February 2017 - 06:10 PM

Give Rick (R GEO) and Mike Swiss time I'm sure they'll come up with something. LOL


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