anyone using mcmaster's bridgeport ballscrew kit?

[fast89]

I'm kicking around the idea of putting some ballscrews on my 9x42 Bridgeport, possibly for a future cnc conversion but for now, just to fix some worn nuts with no more adjustment. Mcmaster sells a kit for $700 for both screws with nuts and the yolk. Mcmaster's part number is 29995A74. Pretty cheap for a bolt in deal. Accuracy is stated as +/- .003" per foot. Anyone use this or have any input on it?

[machintek]

Must be rolled and not ground ball screws. I hope you have a DRO. In theory you can be off up to .009 inches over 36 inches. But if you have ever felt a S1STD with ball screws, they glide! Just do not climb mill unless you are very careful.

George

[fast89]

Affirmative on the DRO, can't live without it. I was kind of wondering what ballscrews would do to the tables ability to hold a position.

[Mel White]

I have precision Ground Ball Screw kits for your mill accuracy .0005 per foot.
$825.00 complete.

Mel White

[NC Cams]

spend the money - get the ground ones. You'll NEVER use an acme or rolled screw after using a precision ground one. BTDT.

Want deadly accuracy? Replace the ball screw bearings with H prelaod AC's. BTDT as well.

Hint 7204A5TYDUH plus custom spacer for outer rings - available from MC as outer ring preload washers. No need for ABEC 5 or 7, Generic 7204A5's 's can be preloaded by KAF Mfg in Stamford CT.

You'll never have to chase backlash again if you do it all right, right now.

[DareBee]

Uh - guys.
This thread is almost 2a old.

Good info though

[bearracecars]

hey mel white
do you have more info or a place to find info on your kits?
bear

[79TigerPilot]

Mel,
Can you give me more information, I am currently searching to buy a ball screw conversion for my Bridgeport J-Head I am converting to CNC.
Do you have a web site etc?

Craig

Originally Posted by Mel White I have precision Ground Ball Screw kits for your mill accuracy .0005 per foot. $825.00 complete. Mel White

[Mel White]

Originally Posted by 79TigerPilot Mel, Can you give me more information, I am currently searching to buy a ball screw conversion for my Bridgeport J-Head I am converting to CNC. Do you have a web site etc? Craig

I have spent the last fifty years in the importing and manufacturing of Machine Tools. A large portion of this time has been the manufacturing of CNC machines. I recently sold my company (AMERITECH CNC) and have a few items that I kept to give me something to do mostly Ball Screws. I have 30MM diameter X and Y ball screws that are industrial grade machined and ground on both ends of X and one end on Y. Same dimensions on the ground surfaces as your existing screws. These are precision products with the accuracy of 0.0005 per foot non accumlative. A set consists of the X and Y ball screws with ball nuts plus the Yoke. These are made in Taiwan by an old friend of mine and are excelent quality I have used hundreds of his products in our machines.The price for the compete set is $825.00.

I also still have a few sets of X and Y castings all machined ready to bolt on the end of x and the front of y. These fit directly to the existing mounting holes on your machine and come complete with pulleys,belts and precision angular contact bearings. These castings are built for Nema 34 motors.
$ 450.00 for the complete package. If you are interested I can forward photos to you. I can give you advice as needed if it would be helpful to you.
Mel White melatthewhitehouse@cox.net 702-443 4447

[nate]

Well, I just bought a set with mounts from Mel.

My money is on its way, I hope to get the kit soon.

Anyone else purchase a set?

[nate]

Well, I just bought a set with mounts from Mel.

My money is on its way, I hope to get the kit soon.

Anyone else purchase a set?

[polaraligned]

Mel, any motor mounts for the knee?