I have just found your site. I was as impressed with the work you have put into making of this . This is what I call real Clock repairing. Far superior and interesting. And honest. Fabulous.
Thanks Jon for the kind comments. We have lots more in the pipeline. Don't forget to check out our other channels including Open Clock Club, our LIVESTREAM and our Facebook page. Matthew
@@orchardwatchandclockrepair8346 Hi Jon search Facebook "how to repair pendulum clocks". Search CZcams "Open Clock Club" and CZcams "how to repair pendulum clocks - LIVESTREAM". Thanks Matthew
12:08 (sorry for so many comments - this is just fascinating!) It looks like the paper-model rack arm length makes a 90° angle with the radius of the snail when at the 6 o'clock point. That's interesting because that design sort of splits the error between the arc of the rack arm vs. the straight line of the radius of the snail.
Yes, I couldn't quite figure out where the sweet spot should be but of course 6 O'clock makes sense. The error is small but there non the less. Not quite sure why Hindley designed it like this???
I must not be paying attention: at 14:34 you point out that at 6 o'clock the rack arm is nearly perpendicular to the radius of the snail. Resolved: I'll watch each video twice before making any comments. Doh!
What a nicely provocative video - thank you! 1) I'd never thought about the relationship of the rack, rack arm, and snail before - so the video has made my head explode, and 2) the geometer in me is feeling picky about the rack arm's movement being an arc rather than a straight line that intersects the center of the snail. in your experience, did different clockmaker's approach the problem differently? That is, would different historical clock makers, faced with the same rack length, pitch, and center distance come up with different values for the rack arm length or different (possibly varying) step sizes in the snail? it's a nice geometrical problem, and thanks again for your wonderful videos.
Oops! Re-watching, I see that at 2:29 you answered my question: "Normally the rack pin travels on an arc that passes through the center of the snail; a kind of rule of thumb. In this case however, the value of the rack arm is less than the center distance...." So different clock makers did come up with different rack arm lengths. Cool. Thanks again.
Its a good question. I suppose they made one part then made the other from that rather like I did with marking out the replacement steps. You often see all the concentric circles scribed on. I think by the late eighteenth century pretty much all makers had moved to the manufactory system so the rack pin passing through the centre won out. If you are just making a few clock though, it dopant matter as long as both parts agree? Thanks again for engaging with videos. So many repairers encounter broken or bent rack arms and get very stuck and then begin to file things and everything goes downhill!
My clock has a KSU movement. Everything works great except that at 9 it gives only 8 gongs and at 10 it gives 9 gongs. After 10 the number of gongs corresponds to the hour. Could this be corrected with just a drop of oil between the rack and the snail?
Yes I presume the rack arm gotten damaged, maybe because the rack spring was too strong?? When it was repaired the repairer presumably gotten into a pickle and started filing which was of course the beginning of the end. If you start filing a clock by Hindley you really should ask the question... one of the finest clock and instrument makers... M
9:22 I think the written large S value is incorrect. It should be something like 11 * small S, but instead it's about the same: 1.32 vs 1.29 mm. At 7:48 you measure large S directly as 14.57 mm, then talk about 14.57 / 11 being 1.32. So I think what's in the diagram is large S / 11 rather than large S. Thanks again for this math-filled and useful video.
Thank you for thinking it though. At the time I had no CAD, otherwise I would have drawn it out more accurately which as you know, always helps. I now have Fusion... just need to work out how to use it!
@@howtorepairpendulumclocks I used Fusion 360 for 2 years and was very happy with it. I then switched to FreeCAD (www.freecadweb.org/) 1 year ago because of changes in Fusion's hobbyist license. That license change made me worry that I might need to pay a professional license in the future, because I'm using CAD drawings in my work-in-progress book on functional 3D printing. In contrast, FreeCAD is open source and free. Now that I'm used to FreeCAD's Part Design Workbench, I'm really happy with it. So in short: Fusion's upside: more polished; FreeCAD's upside: a strong commitment to being free and open source in the future. Good luck with whatever program you choose.
Excellent video. Novice here. The rack arm if gets weak can this cause it to ride on the snail face sometimes? Can this be problem be solved by making sure the snail hasn’t too much play back to front. I’m trying to work on a tall case clock movement. Also the two small screw holes that hold the hour hand is that literally all they do or another use ? Thanks a lot
That may be the case. Normally the rack arm, especially if it is the brass type designed to act as a spring can gently be hammered (gently) on a complaint surface to curve it very slightly so the rack pin falls on the snail. yes there has to be some end shake on the snail/hour wheel but unless something has been altered/filed, it should not be so much to cause a problem. Look very closely at all components for signs of alteration. Look at the relationship between the back of the minute and and hour pipe as this is often what determines 'play' or end-shake. alter nothing until you are confident you can see what has changed otherwise you simply risk adding to the problem. Yes the two screws hold the hand on, that is all. Sometimes there is one screw, sometimes pins, sometimes the hand just pushes onto the pipe, no fixings. Please check out our Facebook group where you can get more help. Yours Matthew facebook.com/groups/424742035582369
@@howtorepairpendulumclocks thank you. I’ll examine all that later. The rack arm which is brass does seem pretty rigid still. Possibly too much play on the min and hour pipe.
Ha yes! Good point. I grew up with metric then 'discovered' imperial when I gotten into clockmaking and had to decipher everything. I now use the two reasonably interchangeably and you are correct of course, the clock was made in imperial and yes, metric much easier on the math. In the museum world that I sometimes occupy, all reports and documentation is in metric so even when there is for example, a 12" dial, we write 302mm or whatever it is. M
Thanks for the discussion on alternatives and how you had second thoughts. Refreshing.
Thanks Matthew, really helpful in trying to resolve my own movement's issues.
So happy to see you making these videos! I hope to learn a lot from you. Keep them coming!!!
Thanks Matthew, let us know if there is anything specific you want us to cover...
I have just found your site. I was as impressed with the work you have put into making of this .
This is what I call real Clock repairing. Far superior and interesting. And honest. Fabulous.
Thanks Jon for the kind comments. We have lots more in the pipeline. Don't forget to check out our other channels including Open Clock Club, our LIVESTREAM and our Facebook page. Matthew
Mathew. We're can I find your other videos. And how on face book
@@orchardwatchandclockrepair8346 Hi Jon search Facebook "how to repair pendulum clocks". Search CZcams "Open Clock Club" and CZcams "how to repair pendulum clocks - LIVESTREAM". Thanks Matthew
that is very valuable experience in this video thanks very much -god help me to understand and help you to give us time to learning
Thanks Mohamed. Glad it was of use.
12:08 (sorry for so many comments - this is just fascinating!) It looks like the paper-model rack arm length makes a 90° angle with the radius of the snail when at the 6 o'clock point. That's interesting because that design sort of splits the error between the arc of the rack arm vs. the straight line of the radius of the snail.
Yes, I couldn't quite figure out where the sweet spot should be but of course 6 O'clock makes sense. The error is small but there non the less. Not quite sure why Hindley designed it like this???
I must not be paying attention: at 14:34 you point out that at 6 o'clock the rack arm is nearly perpendicular to the radius of the snail. Resolved: I'll watch each video twice before making any comments. Doh!
Thank you, Great insight,
Brilliant video.
Thank you
What a nicely provocative video - thank you! 1) I'd never thought about the relationship of the rack, rack arm, and snail before - so the video has made my head explode, and 2) the geometer in me is feeling picky about the rack arm's movement being an arc rather than a straight line that intersects the center of the snail. in your experience, did different clockmaker's approach the problem differently? That is, would different historical clock makers, faced with the same rack length, pitch, and center distance come up with different values for the rack arm length or different (possibly varying) step sizes in the snail? it's a nice geometrical problem, and thanks again for your wonderful videos.
Oops! Re-watching, I see that at 2:29 you answered my question: "Normally the rack pin travels on an arc that passes through the center of the snail; a kind of rule of thumb. In this case however, the value of the rack arm is less than the center distance...." So different clock makers did come up with different rack arm lengths. Cool. Thanks again.
Its a good question. I suppose they made one part then made the other from that rather like I did with marking out the replacement steps. You often see all the concentric circles scribed on. I think by the late eighteenth century pretty much all makers had moved to the manufactory system so the rack pin passing through the centre won out. If you are just making a few clock though, it dopant matter as long as both parts agree? Thanks again for engaging with videos. So many repairers encounter broken or bent rack arms and get very stuck and then begin to file things and everything goes downhill!
My clock has a KSU movement. Everything works great except that at 9 it gives only 8 gongs and at 10 it gives 9 gongs. After 10 the number of gongs corresponds to the hour. Could this be corrected with just a drop of oil between the rack and the snail?
The rack arm being too long was why the snail had to be modified in the first place.
Yes I presume the rack arm gotten damaged, maybe because the rack spring was too strong?? When it was repaired the repairer presumably gotten into a pickle and started filing which was of course the beginning of the end. If you start filing a clock by Hindley you really should ask the question... one of the finest clock and instrument makers... M
9:22 I think the written large S value is incorrect. It should be something like 11 * small S, but instead it's about the same: 1.32 vs 1.29 mm. At 7:48 you measure large S directly as 14.57 mm, then talk about 14.57 / 11 being 1.32. So I think what's in the diagram is large S / 11 rather than large S. Thanks again for this math-filled and useful video.
Thank you for thinking it though. At the time I had no CAD, otherwise I would have drawn it out more accurately which as you know, always helps. I now have Fusion... just need to work out how to use it!
@@howtorepairpendulumclocks I used Fusion 360 for 2 years and was very happy with it. I then switched to FreeCAD (www.freecadweb.org/) 1 year ago because of changes in Fusion's hobbyist license. That license change made me worry that I might need to pay a professional license in the future, because I'm using CAD drawings in my work-in-progress book on functional 3D printing. In contrast, FreeCAD is open source and free. Now that I'm used to FreeCAD's Part Design Workbench, I'm really happy with it. So in short: Fusion's upside: more polished; FreeCAD's upside: a strong commitment to being free and open source in the future. Good luck with whatever program you choose.
Excellent video. Novice here. The rack arm if gets weak can this cause it to ride on the snail face sometimes? Can this be problem be solved by making sure the snail hasn’t too much play back to front.
I’m trying to work on a tall case clock movement. Also the two small screw holes that hold the hour hand is that literally all they do or another use ?
Thanks a lot
That may be the case. Normally the rack arm, especially if it is the brass type designed to act as a spring can gently be hammered (gently) on a complaint surface to curve it very slightly so the rack pin falls on the snail. yes there has to be some end shake on the snail/hour wheel but unless something has been altered/filed, it should not be so much to cause a problem. Look very closely at all components for signs of alteration. Look at the relationship between the back of the minute and and hour pipe as this is often what determines 'play' or end-shake. alter nothing until you are confident you can see what has changed otherwise you simply risk adding to the problem. Yes the two screws hold the hand on, that is all. Sometimes there is one screw, sometimes pins, sometimes the hand just pushes onto the pipe, no fixings. Please check out our Facebook group where you can get more help. Yours Matthew
facebook.com/groups/424742035582369
@@howtorepairpendulumclocks thank you. I’ll examine all that later. The rack arm which is brass does seem pretty rigid still. Possibly too much play on the min and hour pipe.
I am surprised you are using metric measurements on an obvious imperial construction. So 1.29mm = 3/64”? Obviously metric is easier on the maths!
Ha yes! Good point. I grew up with metric then 'discovered' imperial when I gotten into clockmaking and had to decipher everything. I now use the two reasonably interchangeably and you are correct of course, the clock was made in imperial and yes, metric much easier on the math. In the museum world that I sometimes occupy, all reports and documentation is in metric so even when there is for example, a 12" dial, we write 302mm or whatever it is. M