VDE-200 (Schnekenstruder Rev. 2) February 24, 2022 06:04PM |
Registered: 4 years ago Posts: 285 |
Re: VDE-200 (Schnekenstruder Rev. 2) January 10, 2024 09:24AM |
Registered: 3 months ago Posts: 5 |
Re: VDE-200 (Schnekenstruder Rev. 2) January 10, 2024 07:15PM |
Registered: 4 years ago Posts: 285 |
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cyber_v1
Hi!
I'm curious about this design; do you mind sharing the model or explain better about how the titanium insert was made? I don't really understand how it can have an internal bore of 1.60mm if the filament diameter is 1.75mm.
Re: VDE-200 (Schnekenstruder Rev. 2) January 10, 2024 07:21PM |
Registered: 3 months ago Posts: 5 |
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rq3
Quote
cyber_v1
Hi!
I'm curious about this design; do you mind sharing the model or explain better about how the titanium insert was made? I don't really understand how it can have an internal bore of 1.60mm if the filament diameter is 1.75mm.
The design is basically a swashplate, with the friction of the bearing balls providing the drive ratio between the inner hollow drive shaft, and the outer bearing drive diameter.
The inner titanium insert is a press fit in to the bearing bore. In a lathe, a counterbore cutter is used to make the internal knife edge by plunging from both ends.
A 1.60 mm bore on the knife edge gives a roughly .075 mm bite of the knife edge into a 1.75 mm diameter filament.
Re: VDE-200 (Schnekenstruder Rev. 2) January 10, 2024 07:37PM |
Registered: 4 years ago Posts: 285 |
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cyber_v1
Quote
rq3
Quote
cyber_v1
Hi!
I'm curious about this design; do you mind sharing the model or explain better about how the titanium insert was made? I don't really understand how it can have an internal bore of 1.60mm if the filament diameter is 1.75mm.
The design is basically a swashplate, with the friction of the bearing balls providing the drive ratio between the inner hollow drive shaft, and the outer bearing drive diameter.
The inner titanium insert is a press fit in to the bearing bore. In a lathe, a counterbore cutter is used to make the internal knife edge by plunging from both ends.
A 1.60 mm bore on the knife edge gives a roughly .075 mm bite of the knife edge into a 1.75 mm diameter filament.
Thanks! I think I understand the first part. But I don't understand about how to make the internal knife edge with a counterbore cutter. Do you bore at an angle? What is the resulting shape of the knife? I'm sorry for dumb questions. I'll try to sketch something after work to make it more clear :-]
Re: VDE-200 (Schnekenstruder Rev. 2) January 10, 2024 08:25PM |
Registered: 3 months ago Posts: 5 |
That's what I thought! But now, if the bore is 1.60mm and it's put at an angle to the filament, it's less than 1.60mm in the plane perpendicular to the filament, isn't it? It should be 1.60mm/cos(15°)=1.66mm. But maybe I miss something.Quote
rq3
Put a thick wall tube in a lathe. Plunge a countersink into the tube. Retract the countersink. Reverse the tube in the lathe. Plunge the countersink until the bore is good.
Re: VDE-200 (Schnekenstruder Rev. 2) January 11, 2024 06:18AM |
Registered: 3 months ago Posts: 5 |
Re: VDE-200 (Schnekenstruder Rev. 2) January 12, 2024 06:18AM |
Registered: 3 months ago Posts: 5 |
Re: VDE-200 (Schnekenstruder Rev. 2) January 12, 2024 07:25PM |
Registered: 4 years ago Posts: 285 |
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cyber_v1
It looks like the 1.60mm bore won't work as the knife then intersects the filament on all sides.
I also don't really understand how it may work since the part is totally symmetrical and it can't "prefer" to which side to push the filament.
[attachment 120741 intersect.png]