How hard could it be?

Post your completed retrofits for the world to see.

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Doc_rot
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How hard could it be?

Post by Doc_rot »

I was led astray by a friend of mine and he convinced to buy this non running Bridgeport Boss for $500. How hard could it be to retro fit this?
To give you a frame of reference of my skill level I had very little experience with any type of wiring other than 12V stuff on motorcycles. I also did not know much about CNC technology, and still don't. I did some CNC router programming in college and that is it.

Once I got this machine in position in my home garage I started to panic as I realized I was in way over my head. Thankfully Marc at CNC Services NW is only an hour away. He designed a system for the retro fit, made a fabulous wiring diagram, and answered all of my numerous questions. Without him I would be completely lost. Marc if you are reading this - thank you!

After a little over two years of fiddling about I made the first chips with the machine this week. It has completely reinvigorated me on this project. which has sadly been on the back burner for too long. Its hard to make progress on this kind of stuff when every element is something new to learn.

There are still a few issues that need to be sorted before its 100% but I am astonished that I was able to pull this off considering my complete lack of experience.

The main issues I need to rectify are the brake solenoid isn't working, and far more worrisome - I think the spindle bearings may be bad. When the tool gets a load on it there is a pretty loud chatter, it goes away with a heavy load. I still need to investigate further.

I'm excited to learn from this forum!
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martyscncgarage
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Re: How hard could it be?

Post by martyscncgarage »

Congratulations on the accomplishment. As far as I'm concerned, Marc is one of the best resources we have!
Marty
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cnckeith
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Re: How hard could it be?

Post by cnckeith »

Nice! thanks for posting, yet another Boss! how many of these great machines are out there still?
the achilles heel of the machine is the whole variable speed mechanism, that cone system eventually makes the noise you describe and get worse and worse, (you can run them for quite some time with the noise). I've seen Boss owner completely gut the variable mechanism and belt the motor to the spindle with new pulleys and belt and then of course use a VFD for programmable spindle speed. this results in a really nice quiet machine and a bump in torque since you got rid of the friction loses with the trapezoidal belt/cone drive. but, it is a project!
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richardb15
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Re: How hard could it be?

Post by richardb15 »

I had a similar Bridgeport that was deafening to run and it was the moving variable pulley that was rattling around on the shaft. It was quite an easy job to pull all that stuff off and replace with an 8M HTD belt and taper lock pulleys then run the spindle motor on a VFD. Ran as quiet as you could want after that and much better surface finish, a highly recommended upgrade for any machine with the variator pulley setup.


tblough
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Re: How hard could it be?

Post by tblough »

If you really want quiet, ditch the toothed timing belt and go to a micro-v belt.
Cheers,

Tom
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I have CDO. It's like OCD, but the letters are where they should be.


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