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Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Steve, Yes, I will use the Predikter coz I think it is pretty good too!
Anyway, I settled for the easy way out: 2 brushes. Below are details:
The carbon brush to the right is just there, because I didn´t use that option. Daniel did, and he will harvest the consequences of that decision. I decided to wrap lengths of RG-218 screen stocking around blocks of tufnol, clamped at the back with a copper block, which also acts as attachment for the tapping cable. Seen from the front:
With one of the brushes protruding. The front face of the tufnol stock is lapped to the curvature of the primary coil, and the fit would appear to be acceptable:
A view from the rear exposes the 4 possible connections to tapping point cable and reveals that I have not yet figured out how to make the spring that presses the brushes against the primary coil. I will tomorrow. The 4 brass details that meet with the primary coil on the inside will be replaced with miniature ball bearings, as soon as they arrive.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Coronafix wrote ...
Nice work Finn, but how does it travel along the primary?
At the bottom of the primary coil is an arm, with a vertical stick that engages with the tapping point carrier. When the arm rotates, the tapping point follows. As the work progresses, you will see it in detail.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Aarrrh! The smell of tufnol in the morning!
When coiling gets serious, the material of choice for select parts is Tufnol.
On a coil of this caliber, a surface finish of lesser quality than that produced by a tungsten carbide milling cutter would be an abomination.....
The primary assy' is tufnol, brass and stainless, except the high class Maxon DC-motor used to drive the adjustable coupling arrangement.
In this closeup, you can see the mechanism that will allow me to adjust the coupling of the coil, real time. It has been tested and verified to lift my 85Kg!
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Nicko, you are right.
Without it, it is a struggle beyond description to get the secondary with attached topload upright on the primary assy'. This coil is big enough to warrant the use of a crane, but we don't want to depend on cranes. With this hinged platform, we can open the hinge, attach the secondary while it is lying in a horizontal position and then, with the bottom secured in position, just flip it up into vertical.
The space hardware you linked to looked like it had completed the same motion, but in reverse ?
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Had a couple of hours to spare, so turned to Thumpa'
It would be an act of vanity to asume, that the primary coil could be produced completely round. Also, that the assembly that drives the tapping point along it, is centered with enough precision.
In the ordinary coil, this is of no consequence, but this is no ordinary coil.
So some sort of mechanical buffer has to be inserted between the driver and the driven, to keep it from jamming.
Inserted are 2 blades of 0.2mm thick G10. They act as leaf springs, giving the tapping drive stick unrestricted axial movement, within amble reason. Took 4 hours to design in Solidworks, 3 hours to complete in real life.
I had put the solution to this problem out, due to it containing many parts to solve just one problem, so I am happy that it is now in the book.
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