John Harrison Grasshopper escapement 3D printed clock: First clock run prototype

Step 2 of the design of a 3D printed clock with a twin pivot Grasshopper escapement : First clock run prototype
The design of the escapement is based on the information I found here:
base on COMPUTER AIDED DESIGN of HARRISON TWIN PIVOT and TWIN BALANCE GRASSHOPPER ESCAPEMENT GEOMETRIES by David Heskin
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Animation can be seen here:
• Two Pivot Grasshopper ...

[@animoose]

Nice work! Looking forward to the final version.

[@TheGreatTimSheridan]

Wonderful clock. Everything should be adjustable, pendulum, cheeks… Looking forward to hearing about accuracy

[@stevesclocks]

Nice clock. I like the removable body to make adjustments without having to remove the pendulum. I tried a few grasshopper clock experiments. It needed a lot more drive weight to run compared to a similar sized deadbeat escapement. All the energy used to lift the pallet arms is lost after they release. Try reducing the counter-weights to the minimum needed to return to the resting position. Less energy used to lift the pallet arms means the clock should run with less drive weight.

[@jacquesfavre999]

Thanks Yes 12 kilo's for a 4 day run, that is the same as 3 kilo for one day, that is 50% more than the deadbeat escapement, that is not too bad It is just that 12 kilos on the PLA frame is a lot I am going to double the size of the drum for a start Maybe I will switch to some kind of remontoir with electric motor like the burgess clock B Lots of little things to tune up, balance the anchor, pallets with just enough lift when realeased

[@stevesclocks]

@@jacquesfavre999 Wow, 12kg is a lot of weight. This seems like your longest running clock. The low friction of the pendulum support probably helps. I agree that grasshopper escapement are probably not as efficient as a deadbeat. I think the rate changes when you change the drive weight, similar to an anchor escapement.

[@janetmorris6792]

I'd better hurry up and finish your last creation so I can buy the plans of this when your final design is completed. I love building your clocks and filling up one of my walls nicely, I don't put them on the wall of my conservatory any more as had a partial melt down and distort due to the heavy bob weight.

[@TheGreatTimSheridan]

cuckoo is good for getting the Clock in beat, but you should measure with an accurate quartz watch that has a second hand. Small adjustments will require special knobs with the calibration, then You can adjust the clock in three measurements.

[@janetmorris6792]

I am also in the middle of printing out one of your design's at a reduced size on my resin printer so I wonder how that will work out