Rebushing the front plate - Urgos UW32/1A grandfather clock movement. Part 1 of 2.
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- เผยแพร่เมื่อ 16 ก.ย. 2024
- Repairing the Urgos UW32/1A movement from one of the grandfather clocks in The Wagon Wheel antiques shop in downtown Historic Ellicott City, MD.
This movement was ceased and I was asked to see what I could do with it. The movement was in pretty bad shape with 7 pivot holes requiring new bushings, 3 in the front plate, 4 in the back plate. It was caked with old hardened oil and doesn't appear to have been serviced in a very long time, if ever.
I made this video simply as a demonstration of using a drill press adapted for bushing work. This segment covers centering, reaming, and pressing one new bushing. The second video demonstrates broaching the new bushing to the correct size for the arbor pivot.
Part 2 can be found at • Rebushing the front pl...
Since I've received a LOT of requests for the drill press adapter, here's a link to it on Merritt's website. I got mine at Timesavers.com, but they no longer carry it. I'm so glad Merritt's had it now. www.merritts.c...
Great video, how do you work out where the center of a worn hole should have been?
Any kind of center tool will surely fall into the widest point of the worn hole, not the original center, so how can you get the new hole back on its original and proper center?
Inssan, that’s a great question. Since finding the original center is critical, it is of course something that must be carefully studied before commencing with the reaming.
Also, one must be sure there’s as little slop or movement in the tools used or the ream will just drift off center.
Use a magnifier if necessary and look for signs around the original bushing hole that would indicate the original oil cup bevel versus the more vertically cut side where the pivot worked its path away from center. The direction of travel will always be in one direction since it’s the pressure of the drive spring or weights that cause the pivot to cut a path away from center.
If you’re pretty sure, but not convinced you’ve found the original center, it’s also a good idea to observe the wheels with the plates assembled and the spring/weight tension removed. Align the wheels so the teeth mesh evenly and observe the pivot location. This of course can be done before initially disassembling the plates since that makes the job much easier.
Once you’ve located the original center, use the center finder bit to get your plate aligned correctly and then clamp it down. Use very gentle touch to get your ream started and it’ll work out fine.
I have, on occasion, had a bushing so worn out that a new bushing would not fit without falling through. In those cases, I cut the hole to the next size up, used an oversized bushing and then reamed that larger one out enough to fit the smaller, correctly sized bushing into it. I don’t much like “double bushing” but it’s sometimes the best solution.
Good video. Just thinking, Why not use the drill press on low RPM to ream?
Thanks,
Alan in Virginia
Alan, thanks for watching!
It’s all about precision control. I only need a few turns to ream through brass. It cuts VERY easily by hand. Starting the motor would tear it up completely in an instant. Even the slowest RPM setting on the press would be 1000x too fast. Plus, the ream needs to be turned in both directions to cut/clean the way I like it. “REAL” reamer rigs have no motor at all. Just gentle hand-cranking. This was my solution on a very tight budget.
Very cool please do more videos. Newbie here
Thanks, Marion!
What would you like to see?
The basics of clock repair. How to diagnose why a clock wont stay running etc..Maybe a video for people interested in clock repair as a hobby. What basic tools that are needed. Thanks much
Super cool. Thanks for putting that together :)
Where can we buy thise bushing machines? Thank you!
Good video. I am starting out. What do I need to do bushing by hand? I have successfully taken apart about 7 cuckoo movements, cleaned and put them back together. A couple need bushings. Heya is the best way to start doing this without investing a lot of money in the beginning?
Francis Cole, I’m glad you found my video helpful. Be sure to watch part 2 for the finishing of the bushing job.
My reamers are actually designed for hand use. I use the drill press to help with alignment so I get an accurate hole that’s perfectly perpendicular to the plate. But if you practice on a few junk holes, you can quickly become plenty good enough to bush completely by hand.
Visit timesavers.com or merritts.com for tools and bushing variety packs. I recommend starting with a tray of bushings such as timesavers.com/i-8944942-american-brass-kwm-bushing-assortment-no-ii.html but be sure to review the sizes you need most. There are plenty of sources, so shop around.
For the bushing tool, look at something like timesavers.com/i-8948895-kwm-style-hand-reamer-set.html
You’ll also need a set of cutting broaches and a set of smoothing/polishing broaches. timesavers.com/search.html?q=Broaches&go=Search
Have fun!
I just saw this! I appreciate your response! Thank you very much for taking the time out to answer.
if its a regula 25 you can buy a new one for 70$, no one bushes cuckoos, Unless it is a 8 Day with Sentimental
TheOnKnee I bush all cuckoo movments and know a lot of guys that have only ever replaced a handful of them. I’ve successfully bushed 70 or so movements since September. All are still running great. I can strip a regula 25 down have it cleaned bushed and polished in less than 5 hours, many are dated and go with the case. Many older ones are all brass, and built better like the perch flag, starwheel, wheels etc.
Since I've received a LOT of requests for the drill press adapter, here's a link to it on Merritt's website. I got mine at Timesavers.com, but they no longer carry it. I'm so glad Merritt's had it now. www.merritts.com/merritts/public/product.aspx?ProductID=81080
Hat tip to @Marklemon9659 for digging this up for everyone!
where did you get the clamp?
Hi, David. I got it either Merritt's or Timesavers. But it appears neither currently carries it. I've had lots of people asking about it so I'll try to find out who still sells it. But you could probably call TimeSavers and ask them.
Where did you get the clamp apparatus to clamp the plate to the drill press?
I got it at either Merritt's or Timesavers. It was awhile ago so I don't remember exactly.
Looks like timesavers no longer lists this. But I found it at www.bckntime.com/kmw-drill-press-bushing-adapter/
@@afixedpointintime5142 This link and this parts store www sites seems to be always down. Is there another location to find this drill press jig? TimeSavers has a $155 jig called a "Clamp-On Bushing Tool For Use With The KWM System" that looks similar but is obviously different... Any idea what yours is called or cost?