I bought some from there in 2020 and they ran around $15 per gear.
I bought a couple of sizes as didn’t have an old one to compare.
The 64p meshed fine.
I wound up using a 4O3A Rotator Genius controller with the electronic compass
direction indicator so the gears are in my parts box.
Here is the best I could do to copy on my iPhone:
round
Product Number Quantity Unit Price Total
A 1P 2-Y64072C
3 $14.41 $43.23
A 1P 2-Y64080C
2 $14.66 $29.32
Tax $0.00
Shipping $12.09
Fee Amount $0.00
Total $84.64
73,
George / W7GES
> On Jan 6, 2023, at 4:54 PM, Leeson <leeson@earthlink.net> wrote:
> This looks like a very good call. I was browsing various other catalogs for
> Delrin 64 pitch hub spur gears, and eventually came up with the same page Jim
> had already identified. I should first have read his posting in more detail,
> I would have saved some time. There appear to be other gears of this same
> type that are used on different TIC Ring versions, including the 72-tooth
> gear on the same page.
>
> Part Number Teeth PD OD Hub Dia. Set screw
> A1P2-Y64 055C 55 .859 .891 33/64 6-32
> A1P2-Y64 072C 72 1.125 1.156 5/8 6-32
>
> As background, pitch characterizes a family of gears that can mesh, since the
> tooth size and spacing is the same for all members. Pitch is defined as the
> number of teeth that a gear with 1.00" pitch diameter would have. Pitch
> diameter can be calculated from OD:
> (Pitch Dia) = OD * (number of teeth)/(number of teeth +2).
>
> A remaining uncertainty is the possibility that the TIC Ring gears aren't 20°
> pressure angle, but that value seems most common.
>
> For some general info on plastic gears, see
> https://www.mcmaster.com/plastic-gears/component~gear/ Click on Gear Pitch,
> then click on the info symbol, "i" in a circle. For another summary of the
> formulas used to characterize gears, see
> http://www.omnicomponentscorp.com/64-pitch-delrinreg-spur-gears.html
>
> Because I want a bullet-proof setup, my own long-term plan is to use a
> boom-mounted electronic compass with DC output to replace the current pot
> setup, which loses direction all too often and finally led to a coax parting.
> I'm leaning toward using a compass chip in a waterproof plastic box, mounted
> to the boom. Most chips for this purpose nowadays seem to use I2C, and to get
> 0-5V I've found an inexpensive compass and I2C DAC on Adafruit. See
> https://www.adafruit.com/product/5579 and
> https://www.adafruit.com/product/935#technical-details These are really
> inexpensive, and I'm hoping someone will grab hold of the idea and integrate
> such a device.
>
> But even if I can get more reliability, I don't want to rely on direction
> indication alone as the critical element of a limit system. So I also plan to
> set up some physical limit switches, as for example KZ1W has done with his
> TIC Rings. I plan to do this also on my prop-pitch rotators.
>
> Dave, W6NL/HC8L
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