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« Last post by webby2 on April 04, 2024, 03:36:10 pm »
This could be fun,,
I am printing out some test parts for the test-part that on paper shows a 1:1.314 in to out
I used pulleys on the first re-do and now I am using gears, making all those belts was a bother cause it is hard to get the tpu to fuse straight, and then to get the correct tension in it all.
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« Last post by webby2 on March 28, 2024, 05:56:26 am »
Need to add that I have a means of adding in an internal potential, I am using rubber bands to add that potential.
I have been able to add the correct number of rubber bands so that when I hang the 90g mass on the 30mm side I can almost balance the arm, remember that the other side of the arm weighs approx. 20g so not much.
Within the range the internal potential holds, outside the range it does not.
I took the whole system off the mount and and placed the central shaft in a set of bearings and with the rubber bands in place I needed to add 45g to the 30mm side to bring that lever level, so the whole system is balanced around the axle for the lever.
I just did something silly, I mounted the bearing block in my vise and then put the lever axle into that bearing block. My spring scale weighs approx. 45g in total, the scale shows 30g when I hang it from the hook by itself. So for 180 degrees of rotation that spring scale is almost enough weight to hold the lever level, (the scale shows 30g while hanging by itself), pull on it so about about 35g is showing and this comes to a peak, so from no extra needed up to about 5g extra and then back to no extra needed. The other 180 degrees of rotation and I need to pick up on that spring scale a little bit, down to approx 25 and this is again from none needed up to a max and then back down to none needed.
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« Last post by webby2 on March 28, 2024, 05:06:03 am »
On a 30mm arm I have hanging a 185g mass, on a 60mm arm I have hanging a 90g mass through a certain area of rotation the 90g mass picks up the 185g mass with ease, I need to add 30g to the 185g to balance things out. I changed my applied points so that they are 180 degrees across the same axle and on the same lever arm.
The complete lever arm weighs 30g and enough of the arm and parts are on the 90g side that when I weigh that side it is 20g. So this should then be close enough to being balanced. 30@210 60@110 roughly speaking is very close.
I have a range where this seems to hold and a range where it does not.
The whole system is very stiff to move but the weights on the arms move the whole system easy, so that is the internal moving parts are very stiff but the whole system is very free to rotate and move with no masses.
I am looking into a funny thing with this part of rotation relative to the direction of gravity and the relative positions of my system.
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« Last post by webby2 on March 25, 2024, 12:36:27 pm »
this is designed to use bearings for the teeth so that the resistance created on the face is very very small.
I also did this using 2 slightly offset grooves and 2 bearings per so that one bearing was in contact with one face and the other bearing was in contact with the face on the other side, I did that so that I could make it a zero back-lash setup.
This one also works well both ways, that is turn the larger gear and it turns the smaller one or turn the smaller one and it turns the larger one, even at some steep angles
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« Last post by webby2 on March 25, 2024, 06:16:40 am »
changed to mp4
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« Last post by webby2 on March 25, 2024, 04:28:45 am »
Having a small issue with not being able to upload a 35m file that is a .mov of the thing working to spin the upper half one way and the lower half the other way.
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« Last post by webby2 on March 25, 2024, 04:23:04 am »
a single one sided groove so the path can be seen
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« Last post by webby2 on March 25, 2024, 04:22:23 am »
a 4 groove setup
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« Last post by webby2 on March 25, 2024, 04:21:07 am »
a different take on a worm gear
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« Last post by webby2 on March 22, 2024, 03:55:46 am »
This is a little petty maybe but I want my test-part to use a different storage potential than the test-bed. The test-bed uses CP as the storage medium for work transfer and it looks like I can do something similar with the test-part but I want it to do things differently.
If I look at the "how" that may work and then look at what I thought the test-bed was doing,, well I might of over-thought the "how" for the test-bed.
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