Help identify a Bridgeport mill

[Tmitch]

I have a Bridgeport mill which I am trying to identify and get a parts breakdown for.

The base is, I believe, a Series II ex CNC machine, SN T-775. It has an air assisted knee. It has been converted to a manual machine and the head has been replaced with a Series I, 2HP, verispeed.

[machintek]

the T usually stands for a T ram which typically had more than 1 head on it or a head and a tracer valve. Box ways or dovetail ways? Air assist on the knee?

George

[Tmitch]

Originally Posted by machintek the T usually stands for a T ram which typically had more than 1 head on it or a head and a tracer valve. Box ways or dovetail ways? Air assist on the knee? George

I would call the ways "Box", as they are square and chromed. Yes, it does have air assist on the knee.

I am trying to get a parts breakdown, because I inadvertently ran the table (y axis) up against the rear stop while installing a power feed and now the ball screw is moving back and forth about a .1 inch play (less than 1/4 turn). I can't figure out what is supposed to prevent the ball screw from moving back and forth.

[polaraligned]

Originally Posted by Tmitch I can't figure out what is supposed to prevent the ball screw from moving back and forth.

The angular contact bearings right in the front of the knee. Put a dial indicator on the end of the ballscrew and see if the ballscrew itself is moving when you turn it. If so, the problem is in the ballscrew support bearings, if not moving, look for worn ballscrews or maybe loose screws on yoke that attaches to saddle.

[JimPAC]

Take A picture Send it to me and I'll tell you exactly what you have and where to find parts!

BP IRON IS GOOD!

[Tmitch]

Originally Posted by polaraligned The angular contact bearings right in the front of the knee. Put a dial indicator on the end of the ballscrew and see if the ballscrew itself is moving when you turn it. If so, the problem is in the ballscrew support bearings, if not moving, look for worn ballscrews or maybe loose screws on yoke that attaches to saddle.

Yes, the ballscrew is moving back and forth about .1inch, as it is turning. I don't need a dial indicator to see that. It didn't do that before I hit the rear mechanical stop with the new table feed. There must be a stop to prevent the back and forth play of the ball screw that slipped. I can see a brass sleeve at the front of the ball screw (looking up from under the table) with a set screw. Is this the stop?

[Tmitch]

Originally Posted by JimPAC Take A picture Send it to me and I'll tell you exactly what you have and where to find parts! BP IRON IS GOOD!

This picture shows the mill with a Supermax head, which I am replacing with a "real" BP head.

[JimPAC]

Tmitch,

This looks like a series II CNC and it has been converted to conventional.

There is no mechanical stop because it originally used limit switch's!

The play in your travel is probably due to a broken retainer sleve!

You will need to istal limit switches for your power feeds to prevent any more damge from occuring.

I'll send you my guy for parts contact info and he'll tell you how to repair your Series !! BP Jewel.

And for heavin sake paint that thing a different color.

Hope this helps

Jim

[Tmitch]

Originally Posted by JimPAC Tmitch, The play in your travel is probably due to a broken retainer sleve! Jim

Where is this retainer sleeve? Is it on the front or rear of the ball screw???? It sounds like, it is the one I can see from underneath with a set screw on the front of the ball screw. It doesn't look broken, but may have been moved slightly away from the bearing (I hope).

Yes, I have now installed limit switches (too late) on the table feeds.

Come on, Green is beautiful.

My new (old) head is a series I, 2HP verispeed. At least now, the whole mill is Bridgeport.

[Sparky_NY]

Originally Posted by Tmitch Where is this retainer sleeve? Is it on the front or rear of the ball screw???? It sounds like, it is the one I can see from underneath with a set screw on the front of the ball screw. It doesn't look broken, but may have been moved slightly away from the bearing (I hope). Yes, I have now installed limit switches (too late) on the table feeds. Come on, Green is beautiful. My new (old) head is a series I, 2HP verispeed. At least now, the whole mill is Bridgeport.

The retainer sleeve he is speaking of is located behind the crank handles and other hardware, on the outside. It holds the 2 bearings into their bores. It is a round ring with 3 allen screws. The ring itself is made of that real cheap pot metal and the screws pull through very easily. The best thing is to make a replacement with decent metal/aluminum but if you get another original be very carefull not to tighten the screws very much or they will also pull through.

[advt001]

Polar what are you going to do with the Supermax head?If for sale how much?

[Tmitch]

Originally Posted by advt001 Polar what are you going to do with the Supermax head?If for sale how much?

Yes, it is for sale. Would have to be shipped from Oklahoma. It works, and is complete, but it is noisy. Don't know why, I replaced the timing belt not too long ago. Would $1000 be too much (you arrange and pay for shipping).