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?
Durst AC707 replacement column gear
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Contact this guy: https://www.ebay.nl/str/qoppacollectables
Most of these medium format Durst enlarger columns are interchangeable. Will this gear work? https://www.thingiverse.com/thing:5215417
OP
OP
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".
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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.
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.
I have a metal gear that came off a Durst 670 if that will help you?
OP
OP
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!
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.
True but I'll wager some prints are pretty darn good and the build plate could host a dozen or more gears at one time, so print off a box of gears rather than just one.
Depends on how it's being 3D printed. If you're referring to a common filament printer with PLA filament, then maybe - although it will also depend on the print settings. However, there are other materials you can print with that are tougher, and then there are resin printers that can produce tougher prints as well.
OP
OP
I'm thinking that if I can get the broken cog repaired enough I might cast it in something more substantial
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