[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

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

Mel White

[Mel White]

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 [email protected] 702-443 4447

[dmauch]

Do you still have precision ballscrew retrofit kits with a yoke for a bridgeport?
Dan Mauch

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

Mel White

[VickTrinity]

Do you still have precision ballscrew retrofit kits with a yoke for a bridgeport?
Dan Mauch

I'm guessing not - this thread is quite old. I'm looking for ball screws for an old Bridgeport 9"x42" as well. Servo Products has a kit for $2347. I'm price shopping but not finding much.

George

[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.

[broussard]

Always get the Precision Ground to an accuracy grade of C4 class .0005/ft .The ballscrews has a hardening hardness of HRC 58-62 The Ballscrews

[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

[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?

[nate]

Well...my ballscrew kit arrived yesterday!

I will admit that I was a bit nervous sending money orders to a stranger in Vegas, but Mel is a straight shooter. He shipped fast, gave me tracking info and even mailed me a paper invoice a few days later!

I am still waiting on my mounts. they needed to ship from storage at another location.

The ballscrews are very nice. They appear to be very well made. As a Grinderhand, I can tell you that the bearing journals were ground to very precise fits, with good finishes. Both screws came with inspection reports in plastic folders.

I am quite pleased with the ballscrews, and just as pleased with Mel's service. He always answered his phone, and emailed me pictures and tracking info in a timely manner.

I would order products from him again!

Nate.

[79TigerPilot]

Nate,
I picked up my set of screws from Mell in Vegas two weeks ago, they are very nice screws. Mell is a real nice guy who has been in the machine tool business for many years. So far the only thing I have had to do is widen the 3mm key slot to 1/8". As far as I could tell the Y nut flange bolts to the rear side of the yoke. For the life of me I couldn't figure out how I was going have access to tighten the bolts. But if one removes the front bearing mount and slides the saddle and chip shields all the way forward you can reach the back of the yoke from above. Would have had them installed by now but been waiting on some lubrication tubing.

Craig

[leach.jared]

Mel,
Do you have any of the Ballscrew Kits for the Bridgeports available still?

[broussard]

Yes we do We have one set Left $825.00 for the set

Jeff

[79TigerPilot]

Jeff,
I got one of the sets from Mel last year, been very happy with it. The Y was a little short for my machine but was able to get it working anyway. I would still like to see if I can get another 660 mm section of the left hand 32mm FSV 5.08mm pitch lead screw from LeadTeam. I will reuse my nut and do my own end machining. Do you still have contacts with these folks? I tried to email them last year but never was able to get anythning going.

If I were to call them do they have have english speaking staff I could talk to?

Thanks,
Craig