This is topic removing intermittent sprocket on FP20 in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.


To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=010404

---

Posted by Jeff Else (Member # 4063) on 03-28-2010, 01:32 PM:
 
having learned from a stupid and expensive mistake in the use of brute force to remove a long stuck intermittent sprocket on an FP20, what would be advisable to aid in the removal of very firmly stuck intermittent sprockets from an FP20?
 

---

Posted by Pete Naples (Member # 761) on 03-28-2010, 02:49 PM:
 
If you can find such a thing, a small threaded puller.

First make sure the protruding shaft is clean, and that you've removed the sprung film stripper

I use a bit of rag to protect my fingers from the sprocket teeth, it also helps you to get a good grip, pull it off with a twisting motion to break any dried oil/muck adhesion.

If it's so old that it's stuck like this, it would probably be a good idea to to change the oil seal and O ring, If you change or turn the sprocket and 2 days later have to to strip it all down again to change the seal that's now failed you won't bee seing your happy face!
 

---

Posted by Ian Parfrey (Member # 5122) on 03-28-2010, 03:16 PM:
 
First off - rotate the intermittent so that it is in the locked position.

In the case of the FP20, remove the outboard bearing support and stripper.

A drop or two of Inox or similar penetrant on the intermittent shaft before removal is usually enough to dissolve any varnishes on the shaft. Let it soak for a bit.

Remove any bolts, taper pins or other sprocket fixings.

If the sprocket does not slide off with as little force as possible then put another drop of penetrant on the shaft and wait a bit longer.

The sprocket should slide off with very little pressure.

Any undue force will almost guarantee a ed intermittent and a spendy bill later on- usually accompanied by one very pissed off theatre manager/owner.

The intermittent is the heart of the projector and these things demand respect.
 

---

Posted by Monte L Fullmer (Member # 2797) on 03-28-2010, 03:46 PM:
 

quote: Ian Parfrey

---

The intermittent is the heart of the projector and these things demand respect

---