Film-Tech Forum ARCHIVE: Changing the Brass Bushing In A "JJ" Penthouse

This is topic Changing the Brass Bushing In A "JJ" Penthouse in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Don Furr (Member # 1469) on 07-16-2012, 05:44 PM:

The top sprocket bushing in my JJ penthouse needs to be replaced. One Forum member suggested using an Arbor Press. Does anyone else have a suggestion how to do it?

Posted by Monte L Fullmer (Member # 2797) on 07-16-2012, 07:37 PM:

An arbor press is really your best friend to press out brass sleeves since you can do the push with one even stroke, or the continual turn of the stand wheel. And, they're your best friend to press the new bushing back in.

Yet, if you can modify, or add attachments to a bench vise, this can be the second best way, but just have to be more careful.

Posted by Gordon McLeod (Member # 33) on 07-16-2012, 08:36 PM:

i usually heat the casting and then put an ice cube on the bushing
when putting in a new one i put the bushing in the freezer overnight and then they fit in nice and smooth

Posted by Pete Lawrence (Member # 130) on 07-18-2012, 11:09 AM:

If you don't need to apply a large force, a drill press makes a good substitute for a small arbor press. I've also modified large C-clamps to press parts in and out of various things. A good socket set (1/4, 3/8, and 1/2 inch drives) can provide a large selection of "press adapters" of different diameters and lengths. Buy a cheap extension and cut off the female end. You now have something you can securely attach to a drill press chuck or weld to a C-clamp to hold the appropriate socket in place. An extension costs only a couple bucks at a discount store.

Using Gordon's temperature trick makes things go much easier.

If you don't want to do it yourself, a local automotive machine shop should be able to do the job for you.

Posted by Don Furr (Member # 1469) on 07-18-2012, 06:51 PM:

Thanks for your suggestions guys.