Bridgeport parts?

dfarrell

dfarrell

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North of Toronto
Hello all.

I just picked up my first bridgeport mill. The x axis had terrible backlash and the adjustment screw was out of adjustment. So I removed the the feed nut and split it. This got rid of the majority of the back lash but noticed that the nut was badly worn. So I would like to replace it with a new one and was wondering where to source the part?

I could not find any supplier in Canada. But I have to think that there are local places to get replacement parts?

Thanks for any help.
 
dfarrell said:
Hello all.

I just picked up my first bridgeport mill. The x axis had terrible backlash and the adjustment screw was out of adjustment. So I removed the the feed nut and split it. This got rid of the majority of the back lash but noticed that the nut was badly worn. So I would like to replace it with a new one and was wondering where to source the part?

I could not find any supplier in Canada. But I have to think that there are local places to get replacement parts?

Thanks for any help.
Click to expand...

Hit the Practicalmachinist site and post a wanted ad in the tooling and accessories sub forum.

While their may be a source in your area, chances are really good that you will save a bunch by buying out of the States.

If you are changing the nut, consider the screw as well. Usually one does the other in.

If you have a lathe, build one, or build a sleeve and solder it in to the body of the nut. Another option is to cast one in place out of Moglice, using a section of unworn screw to act as your pattern.

Cheers
Trev
 
trevj said:
Hit the Practicalmachinist site and post a wanted ad in the tooling and accessories sub forum.

While their may be a source in your area, chances are really good that you will save a bunch by buying out of the States.

If you are changing the nut, consider the screw as well. Usually one does the other in.

If you have a lathe, build one, or build a sleeve and solder it in to the body of the nut. Another option is to cast one in place out of Moglice, using a section of unworn screw to act as your pattern.

Cheers
Trev
Click to expand...

He could replace it with a ballscrew as well... Some of the cnc conversion kit guys will sell just a ballscrew...
 
http: //hardinge.com

This is an American outfit, but they own the rights to the Bridgeport name. With any luck, they will have parts for older machines.
We have a Series 1 mill at work, and so far the only parts I haven't been able to find are the felt wipers for the table carriage. Those can be made from felt bought at any craft shop anyway :)
 
Hardinge may still have parts, or make something work, but DO NOT put a ballscrew on a manual machine. Fine for cnc, beyond garbage and dangerous on a manual machine.
 
Thanks for all the suggestions guys. Looks like I'll be looking south of the border.

SND. I'm curious why are ball screws dangerous for a manual? I have never heard that before.
 
dfarrell said:
Thanks for all the suggestions guys. Looks like I'll be looking south of the border.

SND. I'm curious why are ball screws dangerous for a manual? I have never heard that before.
Click to expand...

Balls screws are not nearly as self locking as an acme is. If it isn't attached to servos and all that, any little push or cutter bite will move/yank that table all over the place. That's the experience I had years ago with a converted mill that then had all the cnc controls/servos removed to use as a manual mill again, but had the ball screws left in for X-Y. What a POS that boat anchor was.
 
SND said:
Balls screws are not nearly as self locking as an acme is. If it isn't attached to servos and all that, any little push or cutter bite will move/yank that table all over the place. That's the experience I had years ago with a converted mill that then had all the cnc controls/servos removed to use as a manual mill again, but had the ball screws left in for X-Y. What a POS that boat anchor was.
Click to expand...

That makes sense. Thanks. I was considering possibly going ballscrews if I were to change out all the screws anyway, but that changes my mind.
 
Yeah, ball screws are usually a steeper pitch than an Acme threaded rod, and rely upon the holding power of the servo or stepper motor, usually through a reduction of some form, either a belt drive or gearbox.

They are great for their lack of backlash, but they are not THE answer for all things, esp., manual machines.

Cheers
Trev
 
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