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Focusing Rack Issues

 
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camz



Joined: 15 Apr 2004
Posts: 123
Location: Southern CA

PostPosted: Thu Jul 29, 2010 3:49 am    Post subject: Focusing Rack Issues Reply with quote

I have a D with a focusing rack which is ratchety about half way out.

Anyone else have this problem? Any cures?

The rails move easily by themselves, and the focusing gear isn't binding.
But when I cleaned and lubed them and put them back together, there's no improvement. The front standard is timed correctly, too.
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45PSS



Joined: 28 Sep 2001
Posts: 3216
Location: Mid Peninsula, Ca.

PostPosted: Fri Jul 30, 2010 7:54 am    Post subject: Reply with quote

Quote:
I have a D with a focusing rack which is ratchety

I assume that the pinion gear starts to slip on the track and not advance the front standard.

When you had it apart was there any noticeable wear on the pinion or the tracks? Measure the track and pinion with a caliper.

Is there any play in the pinion? I seem to remember a post about adding a washer between the focus knob and body guide to tighten a loose focusing knob or to prevent the focus from drifting when the camera was tilted. Use a brass washer.

Check the squareness of the focus track to the camera body with a square and the front standard at several distances from the body.

If the focusing is slipping at the center and good either side that is an indicator that the track is worn down. If the slippage starts around center and continues to full extension then the pinion is not engaging the track due to mis alignment of the track to the body.
Are the focus tracks removable from the rails that they are on? If so and squareness of the rail is not at fault try putting a .001 to .002 inch thick shim between the track and rail in the section that slips.
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