Durst AC707 replacement column gear

[Jeremy Greenaway]

The nylon ratchet gear in my Durst AC707 enlarger column mechanism has broken in two and isn't reparable. I've scanned fleabay and all sorts on the web but haven't come up with a source for such spares. Anyone any help?

 

[koraks]

Contact this guy: https://www.ebay.nl/str/qoppacollectables

 

[Renato Tonelli]

When my gear for a Durst Pro broke, I got a custum-made replacement from this guy:

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[darkroommike]

Most of these medium format Durst enlarger columns are interchangeable. Will this gear work? https://www.thingiverse.com/thing:5215417

 

[Jeremy Greenaway]

Most of these medium format Durst enlarger columns are interchangeable. Will this gear work? https://www.thingiverse.com/thing:5215417

It's just the job - trouble is, don't know how to contact guy to buy a couple !

 

[darkroommike]

It's just the job - trouble is, don't know how to contact guy to buy a couple !

I can't print nylon on my little Bambu printer, it seems to me though that you should be able to find a local with a much better printer that could do the job for you if you can't contact the guy that posted the file. Or do a search for "who does commercial 3d prints of small parts" and look up a few offering that service. And as a PS ,ost high schools, trade schools, and community colleges have courses in what is now called "Additive Machining".

 

[Ian C]

For such an item, it’s unlikely that Durst made the gears. They were likely ordered from a gear supplier.

It’s imperative that you keep the broken gear for measurement so that a proper replacement can be located and ordered. A machinery service company should have the proper tools to quickly measure it to determine the correct specifications for a replacement.

Since the Durst enlargers were designed and made in Italy, the gears used were almost certainly of the Metric Module Spur Gear design. You might not find a plastic gear (though it’s possible), but there’s no compelling reason that the gear can’t be replaced with a brass or bronze gear. The Module System denotes the size of each gear (tooth size and diameter). You’d also need the thickness, shaft size, bore diameter, and gear-to-shaft attachment type.

Here is a U.S. supplier. You should be able to locate one in your area. If you consult a machinery service company, it should be able to measure the gear and order a suitable replacement.

https://www.mcmaster.com/products/spur-gears/system-of-measurement~metric/

If you’re successful, it would be useful to post the full specifications for the replacement gear so that others can do the same.

 

[Melvin J Bramley]

I have a metal gear that came off a Durst 670 if that will help you?

 

[Jeremy Greenaway]

Unfortunately, the commercial 3D printing companies I've contacted so far have quoted ludicrous prices - anywhere from £80 upwards! I could source a complete replacement column for less than half that! I might go with Melvin's offer - anything to support our TRUE friends and cousins across the pond!

 

[Melvin J Bramley]

The problem, as I see it, with 3d printed gears , is that the plastic filament used in printing is not near as strong as the original nylon gear that is the original.