Thread: WTB: gorton pantograph parts

i'm not sure this is the right place to start but i need a bearing that goes between the upper and lower
bars on a 3u pantograph. in the book i have the numbers are, B.B. cup 3256-A, B.B. cone 3251-A,
felt 7503-A, and stud 5997-A. i talked to the guys at famco machine in racine but they didn't have
any available. so any help would be appreciated. thanks Rick

I don't know about the bearings, but I do have a set of collets I belive that fit that machine.
If interested, odrog11250@aol.com
gordo

The terms cup and cone indicate you need a tapered roller bearing, like those made by Timkin. You should be able to figure out the bearing dimensions from your existing parts.

Larry

thanks larry, but i do know they are ball bearings. there were some small steel balls left around the bars.ilooked in all the books i have at wok but there were no numbers matching those in the book.the balls measure .125 the race measure about 1.003

Originally Posted by sawz5

i'm not sure this is the right place to start but i need a bearing that goes between the upper and lower
bars on a 3u pantograph. in the book i have the numbers are, B.B. cup 3256-A, B.B. cone 3251-A,
felt 7503-A, and stud 5997-A. i talked to the guys at famco machine in racine but they didn't have
any available. so any help would be appreciated. thanks Rick

For my 3-U I found that those were unobtanium non-standard bearings. I ended up boring out the arms to accept standard sized bearings. Where clearance allowed I used cam followers (see http://veridicalsystems.com/gallery/...U/dsc_0167.jpg). From the other pictures in that directory you can see one of the spacers used for a conventional bearing.

IIRC I replaced every bearing on that machine, for several I had to bore out oversize, make, press in, and ream new bushings. Spent more time doing that that I have using it since, but it does work nice now :-)

-Steve M.

thanks steve, we do have some cam followers at work so guess i'll have to follow your lead and do some
machining before i can use this "free" gift. oh did i forget to say this pantograph was given to me.

sawz5

Do you have a part number and/or mfg. for the bearings?

the only part number i have is the one in the gorton manual. they are B.B cup 3256-A and B.B. cone 3251A. i don't know i they
are bearing mfg. no. or gorton part no. but the guys in racine said they couldn't supply them.