Miniature Rack and Pinion sets

[AF6LJ]

Eric;
Let us know what you find.
I want to build a permeability tuned preselector.

[KL7AJ]

There's a guy on Hackaday who built a PTO (Conventional screw thread format)

[KJ6LFD]

https://sdp-si.com/eStore/Direct.asp?GroupID=479

[KC9QVL]

http://www.servocity.com/html/gears___sprockets.html

[KL7AJ]

Hi Sue:

A permeability tuned preselector should be nowhere near as touchy as an oscillator. I did, however, figure out to tame my screw-drive pto...I coated the threads with really thick grease to damp out the slop. (Standard household machine screws are NOT precision devices!

Stay tuned......pun intended.

Eric

[VK4TI]

I want to build a bunch of permeability tuned inductors for some low power antenna tuners, and I think using rack and pinion sets would be perfect. Does anyone know where I can get some small rack and pinion sets that I don't have to order in quantities of 95,000 from Guangzhou?

Eric

Model car gear sets for the rear axle perhaps ?

[KL7AJ]

The more I've learned about the mechanical stability issue of PTOs, the more attractive "official" linear actuators look...and they're getting to be downright cheap!

Eric

[VK6ZGO]

I want to build a bunch of permeability tuned inductors for some low power antenna tuners, and I think using rack and pinion sets would be perfect. Does anyone know where I can get some small rack and pinion sets that I don't have to order in quantities of 95,000 from Guangzhou?

Eric

They used to use them in car radios in VK back in the day,probably in the USA,too,though they may not be accurate enough.
73,VK6ZGO

[AF6LJ]

Hi Sue:

A permeability tuned preselector should be nowhere near as touchy as an oscillator. I did, however, figure out to tame my screw-drive pto...I coated the threads with really thick grease to damp out the slop. (Standard household machine screws are NOT precision devices!

Stay tuned......pun intended.

Eric

This is true;
I love the links posted above they are promising....

[W9GB]

I think using rack and pinion sets would be perfect. Does anyone know where I can get some small rack and pinion sets that I don't have to order in quantities of 95,000 from Guangzhou?

I would agree with earlier suggestion -- check out the parts for high-end Radio Control (RC) cars.... Some use rack and pinion steering.
http://www.ultimatehobbies.com/istar.asp?a=3&dept=29