Bob, what a cool little device. I hope you share the workings of the other one! One technical question though. Given the center positions of the idler gears and the three driven gears, does it suffer from any binding or loss motion? Now that's a newbie question for you! Thank again for sharing. Joe
Joe that's a good question...as a clockmaker I know that gears of different pitches do not mesh...Ferguson knew that too...he also knew wooden gears are more forgiving pitch-wise...so he did in his writings recommend the use of wooden gears...but in case brass was wanted he does show different diameter gears in his drawing...my thought was the Mechanical Paradox needed the same diameter gears to be effective...so I drew a 24 pitch(I think it was 24...10 years ago) involute gear with 39 teeth...I used that diameter and told AutoCAD to very quietly and discreetly scale down the drawing of a 44 tooth 24 pitch gear to that diameter...that worked well if turn by hand which is how I planned to use it...(power driven at speed maybe not so good wear-wise)...so I very discreetly did the same with the 37 tooth gear...I was happy with the results because as you look at the orrery and the stack of the same diameter gears all driven by the center gear it is impressive to see that they all go in different ways...it is fun to see...similar to watching the Eureka tool in action (: ...bob
Hi Bob, Scaling the diameters effectively changes the diametral pitch of the gear. So in a way, I am surprised that they run together as well as they do. I guess wood is more forgiving. When you took it apart for cleaning, what was the wear like between the teeth of the idler gears and the driven gears. Did they wear in or pretty much keep their form?
There was no wear...they were made from Baltic birch plywood...I'd guess the change in the humidity in my house causes more change then fudging the pitch a bit...at low speed involute gears are forgiving...I've had two wooden clocks in my living room for about ten years...gears show no observable wear...cat hair and humidity can be bothersome...and I handmade the gears...I drew involute gears on paper...glued them to the wood and cut them on a bandsaw...then shaped them with sandpaper...this was before the CNC router...in fact the CNC router was made so I could mess about a bit with different gear trains without all the hassle of making them by hand. If you would like to read Ferguson's thoughts on wooden and brass gears download the pdf and on page 137 there is a good paragraph...bob
A beautiful piece, Bob. Looks great! Mind bending how those gears mesh up lol. Thankfully our perception of time only goes in one direction so it should remain "relatively" accurate 😁. Thanks for the share, Bob. Always a pleasure 😊.
What a neat mechanical device. We like the moon as living in a rural dark desert you see many more suns in the night sky then city folks and the moon (our friend the moon is not shown in this device) is often a night light to us. A display case for this lovely tool is going to be nice. You do such great work Rob we are very happy to know of you and your channel, a true joy to watch. Nice router build very useful in your work. Also thank you for sharing how this device works and shares its functions. Lance & Patrick.
Thanks guys...I'm a big fan of the moon and things celestial as well...at sea I always picked out 2 or 3 stars that were visible for the duration of the passage and on night watches I got to watch my new friends move across the sky...one night off Mexico's west coast I mistook Venus for a ship's light it was so bright...it was my rookie year...bob
Thanks Emma...going back to the grasshopper clock now as I must anneal some brass and form it into bob's on the lathe...annealing is outdoor work...wx related...once completed the other orrery is on my list...thanks for stopping by...bob
You know I liked the patina too, but the calendar ring needed securing and the lacquer on the ring was not up to snuff...be interesting to see how it ages...bob
Thanks Chirpy...going to work on the grasshopper clock for a bit...got to form the pendulum bob's while there is good weather...but that orrery does need attention...bob
Be careful when disassemblying anything, NEVER to take needless preacautions against damaging anything...the more delicate this anything is, the less necessary caution is... Scaratches schmatches, bruises and dents...these are a few of my favourite things.
Robert, are your gears made of wood or abs ?? your pins are they tapered ?? yes lets have a look at the Copernicus orrery Did you use Boyer's plans for the Copernicus orrery ? Great video a lot of info Ralph
Hi Ralph...gears are baltic birch plywood...pins are straight brass, but the spring washers under the teac did not work as I planned so a smaller hole and a tapered pin would be how I'd do it today...I did use Clayton Boyer's plans for the Copernicus orrery...very good plans...but I did not follow them...I used the gear set up...it is very good...I've built a couple of Clayton's clocks as well...his plans are great...bob
June 21st isn't the longest day of the year, every day is the same length of time. June 21st is the day with the most daylight hours in the Northern hemisphere.
You kinda got it spot on...my boat's name was Renaissance...not so much because I am a renaissance man...more I just got out of the service and felt a renaissance was in order...bob
Bob, what a cool little device. I hope you share the workings of the other one! One technical question though. Given the center positions of the idler gears and the three driven gears, does it suffer from any binding or loss motion? Now that's a newbie question for you! Thank again for sharing.
Joe
Joe that's a good question...as a clockmaker I know that gears of different pitches do not mesh...Ferguson knew that too...he also knew wooden gears are more forgiving pitch-wise...so he did in his writings recommend the use of wooden gears...but in case brass was wanted he does show different diameter gears in his drawing...my thought was the Mechanical Paradox needed the same diameter gears to be effective...so I drew a 24 pitch(I think it was 24...10 years ago) involute gear with 39 teeth...I used that diameter and told AutoCAD to very quietly and discreetly scale down the drawing of a 44 tooth 24 pitch gear to that diameter...that worked well if turn by hand which is how I planned to use it...(power driven at speed maybe not so good wear-wise)...so I very discreetly did the same with the 37 tooth gear...I was happy with the results because as you look at the orrery and the stack of the same diameter gears all driven by the center gear it is impressive to see that they all go in different ways...it is fun to see...similar to watching the Eureka tool in action (: ...bob
Hi Bob,
Scaling the diameters effectively changes the diametral pitch of the gear. So in a way, I am surprised that they run together as well as they do. I guess wood is more forgiving. When you took it apart for cleaning, what was the wear like between the teeth of the idler gears and the driven gears. Did they wear in or pretty much keep their form?
There was no wear...they were made from Baltic birch plywood...I'd guess the change in the humidity in my house causes more change then fudging the pitch a bit...at low speed involute gears are forgiving...I've had two wooden clocks in my living room for about ten years...gears show no observable wear...cat hair and humidity can be bothersome...and I handmade the gears...I drew involute gears on paper...glued them to the wood and cut them on a bandsaw...then shaped them with sandpaper...this was before the CNC router...in fact the CNC router was made so I could mess about a bit with different gear trains without all the hassle of making them by hand. If you would like to read Ferguson's thoughts on wooden and brass gears download the pdf and on page 137 there is a good paragraph...bob
Thank you Bob. I will download the document and give it a reading. Love your channel by the way.
Your a man of great talents Bob. I use to scuba dive also until my ears quit clearing. Sure miss it.
Morning Al...I miss diving too...I just don't live near any fun sites anymore...bob
Nice machine work and an interesting explanation on intial calibration. Terrific you are displaying these.
Thanks for stopping by Jon...bob
A beautiful piece, Bob. Looks great! Mind bending how those gears mesh up lol. Thankfully our perception of time only goes in one direction so it should remain "relatively" accurate 😁.
Thanks for the share, Bob. Always a pleasure 😊.
Thanks...they are definitely a mind bending set of gears...and so accurate...gotta love it...bob
What a neat mechanical device. We like the moon as living in a rural dark desert you see many more suns in the night sky then city folks and the moon (our friend the moon is not shown in this device) is often a night light to us.
A display case for this lovely tool is going to be nice.
You do such great work Rob we are very happy to know of you and your channel, a true joy to watch.
Nice router build very useful in your work.
Also thank you for sharing how this device works and shares its functions.
Lance & Patrick.
Thanks guys...I'm a big fan of the moon and things celestial as well...at sea I always picked out 2 or 3 stars that were visible for the duration of the passage and on night watches I got to watch my new friends move across the sky...one night off Mexico's west coast I mistook Venus for a ship's light it was so bright...it was my rookie year...bob
Thanks for sharing. That was very in-depth and amazing.
Thanks Sam...bob
excellent video, nice work. excited to see the other one now.
Thanks Emma...going back to the grasshopper clock now as I must anneal some brass and form it into bob's on the lathe...annealing is outdoor work...wx related...once completed the other orrery is on my list...thanks for stopping by...bob
It's a beautiful piece Bob. I liked the patina on it at first but it sure looks better with the buffing and new finish. Take care
You know I liked the patina too, but the calendar ring needed securing and the lacquer on the ring was not up to snuff...be interesting to see how it ages...bob
neat piece, I would really like to see the copernicus orry rebuild for sure.
Thanks Chirpy...going to work on the grasshopper clock for a bit...got to form the pendulum bob's while there is good weather...but that orrery does need attention...bob
G’day Bob, nicely made along with the other I’m sure of similar quality, where did you find the time.
Cheers
Peter
Mornin' Peter...I find the time only with my wife's permission..bob
That calendar ring looks familiar - is that the one that was published in Digital Machinist?
I got it as a CDR file then converted to DXF and its exact origin I'm not sure...bob
Super cool.
Thanks Dave...bob
Be careful when disassemblying anything, NEVER to take needless preacautions against damaging anything...the more delicate this anything is, the less necessary caution is...
Scaratches schmatches, bruises and dents...these are a few of my favourite things.
I agree Carlo...this rebuild went well...one bad solder joint, but glad that let go...so I could fix it properly...bob
Robert, are your gears made of wood or abs ?? your pins are they tapered ?? yes lets have a look at the Copernicus orrery Did you use Boyer's plans for the Copernicus orrery ? Great video a lot of info Ralph
Hi Ralph...gears are baltic birch plywood...pins are straight brass, but the spring washers under the teac did not work as I planned so a smaller hole and a tapered pin would be how I'd do it today...I did use Clayton Boyer's plans for the Copernicus orrery...very good plans...but I did not follow them...I used the gear set up...it is very good...I've built a couple of Clayton's clocks as well...his plans are great...bob
@@robertt-cs8fe what do you think of abs for the gears; different colors yea or nay ?? why the weights from a scuba belt??; you scuba ??
Baltic birch is by far my favorite...try Sloan's Workshop for good pieces...yea I'm an old diver...I lived on the water for over 20 years...bob
June 21st isn't the longest day of the year, every day is the same length of time. June 21st is the day with the most daylight hours in the Northern hemisphere.
day also means "the time when the sun is out". therefore a longer day means just what you said, more daylight.
Wait! You own a sexton and you're a Fly Fisherman? A true Renaissance man.
You kinda got it spot on...my boat's name was Renaissance...not so much because I am a renaissance man...more I just got out of the service and felt a renaissance was in order...bob
wow !
Thanks Ted...bob