- Joined
- Mar 5, 2014
- Messages
- 381
I want to build this cartridge case Annealer. It looks like an easy design to replicate. The concept is to heat the ends of a rifle case to a specific temperature to anneal the neck before re-sizing to extend case life. I have a nice little torch for this project already.
I want an RPM meter to help with repeatability http://www.amazon.com/TmallTech-Dig...UTF8&qid=1452821547&sr=8-5&keywords=rpm+meter
I am wondering if anyone has experimented with these RPM meters. I really need one designed for precisely measuring low RPM in 5-9 rpm range. I could also measure duration instead, but I haven't found a way to do that.
this meter would also be nice for my machine tools.
My thought is to drive the large and small capstans with separate motors for simplicity with a speed control on the large capstan to control the heating duration.
http://www.amazon.com/Small-Worm-Re...=1452823862&sr=8-11&keywords=TSINY+gear+motor
http://www.amazon.com/DROK-Controll...8&sr=8-66-spons&keywords=12v+gear+motor&psc=1
One of my concerns is that I do not want to transfer too much heat to the motor shaft. I think a stainless steel shaft on bronze bearings would be heat resistant enough.
Does anyone have any wisdom? I am wondering if anyone has experimented with these RPM meters. I really need one designed for precisely measuring low RPM in 5-9 rpm range. I could also measure duration instead, but I haven't found a way to do that.
Thanks
John Dennis
I want an RPM meter to help with repeatability http://www.amazon.com/TmallTech-Dig...UTF8&qid=1452821547&sr=8-5&keywords=rpm+meter
I am wondering if anyone has experimented with these RPM meters. I really need one designed for precisely measuring low RPM in 5-9 rpm range. I could also measure duration instead, but I haven't found a way to do that.
this meter would also be nice for my machine tools.
My thought is to drive the large and small capstans with separate motors for simplicity with a speed control on the large capstan to control the heating duration.
http://www.amazon.com/Small-Worm-Re...=1452823862&sr=8-11&keywords=TSINY+gear+motor
http://www.amazon.com/DROK-Controll...8&sr=8-66-spons&keywords=12v+gear+motor&psc=1
One of my concerns is that I do not want to transfer too much heat to the motor shaft. I think a stainless steel shaft on bronze bearings would be heat resistant enough.
Does anyone have any wisdom? I am wondering if anyone has experimented with these RPM meters. I really need one designed for precisely measuring low RPM in 5-9 rpm range. I could also measure duration instead, but I haven't found a way to do that.
Thanks
John Dennis