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Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Wed Jan 18, 2017 8:43 pm
by willofiam
Barrel, caps, arbor....on to the next adventure :D
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Thu Jan 19, 2017 3:04 am
by gerene
Very nice work Wiliam! Looking forward to see your progress!
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Thu Jan 19, 2017 4:56 pm
by willofiam
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Fri Jan 20, 2017 6:50 am
by Bernie Weishapl
Very nice William and looks like excellent work. Will be watching the progress.
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Sat Jan 21, 2017 4:41 pm
by willofiam
Hey Bernie, I was wondering where you were....hope everything is good with you and yours...
I made the next part out of order, just me thinking again It is the great wheel for the fusee along with the fusee ratchet, click and spring. I decided to make the ratchet wheel first, that way I could turn the boss for it and fit the ratchet hole to the boss, might not make sense at this time, thats juts me...No cutter making here, I happened to have one on hand, a multi tooth 60 degree cutter. In photo # 2 notice the little pip I left when I faced the piece, helped in lining up the cutter to center. This too is offset 6 degrees for that positive locking action a ratchet needs, then set the dividing head to 30 divisions and WHALLA. Later I make the click and click spring, for now this is drilled and reamed to 7/16".
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Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Sat Jan 21, 2017 5:35 pm
by willofiam
How do everyone. lets see if I can help explain how to find the offset for radial rake and or tooth cutter offset for things like ratchet wheels or an escape wheel ect...This is a simplified way of doing it and adequate for making cutters or ratchet wheels. say we need the 6 degree offset and we are using a 1" diameter brass blank for our wheel or ratchet.
first find the circumference.
Multiply pi (approximately 3.14) and the diameter of blank to get the circumference.....3.14 (pi)x 1" = 3.14"
We want 6 degrees....that is 6 degrees out of 360 degrees, or 6 divided by 360.....6 ~ 360 = .0166
now take our circumference times .0166 or 3.14 x .0166 = .0523"
move the cutter from center .0523" to get an approximate 6 degree offset
thats pretty close for these small angles and what we have going on here.
another example;
a 1.75" diameter blank and we want 8 degrees offset
1.75" x 3.14 = 5.495 (circumference)
8~360 = .022
5.495" x .022 = .122" move the cutter .122" from center of work piece.
If anyone notices a mistake with what I did please let me know right away so we can correct it, or if you have another way that is easy to understand please put it up, Thanks
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Thu Jan 26, 2017 7:42 pm
by It's Time
William
Just stop to catch up on things. Your build is looking very good. A beautiful clock when done and it will not be long now. Keep up the fantastic work.
Nelson
Re: Building a Grasshopper Escapement Skeleton Clock
Posted:
Thu Feb 02, 2017 8:28 am
by willofiam
Hey Nelson, hope all is well.
Here I will just show some photos of the great wheel, fusee ratchet, click and click spring. In the book he went with a brass clickspring, I decided to make mine out of steel giving it my own little twist, really...instead of the thin edge of the spring contacting the click I put a twist in the steel before hardening and tempering so that the larger flat edge would be making contact, most likely over thinking it all Notice the square nose tool bit, relief was ground on both sides and underneath, this worked good as I could cut all surfaces without changing the cutter. Easing up to the diameter for the ratchet wheel boss worked good for me, checking the fit often with light cuts.
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