Approximate RPM's of digital scale powder dispensers

[Sdupontjr]

I'm working on an automated system for my Beam scale that I just got back from Scott Parker (thanks again). The automation is complete, and I have the motor picked out, but it comes in about 25 different rpm variations. If I can get a motor that is close or faster than these dispensers, I it will work flawlessly. Too fast and I can always slow it down with a controller. But if too slow, will take a little longer.

So, it really doesn't matter if you have a chargemaster 1500, matchmaster, Lyman, hornady, etc. I just need an approximate rpm of the fastest initial speed. I know some of them have about 4 speed setting and slow down as it approaches the set weight. Just need the initial start WFO speed.

And for bonus, the ID of the dispensing tube if possible

Thanks

 

[fkimble@charter.net]

Since we don't know if it's geared down or direct drive or the size of the feed mechanism, it would just be a WAG on our part! Try rotating with your finger to get an idea? But sounds interesting!

Frank

 

[Sdupontjr]

No I actually have a working model using 2 motors and limit switches. It runs 2 motors but cuts one off after a limit switch it tripped. Then the much slower motors take over until it hits yet another switch. Then I can bump if needed.

I have upgraded it to be automated. But want to get a faster motor as you can see it's slow. I can always get a much faster motor and regulate it down.

 

[Homerange]

So, it really doesn't matter if you have a chargemaster 1500, matchmaster, Lyman, hornady, etc. I just need an approximate rpm of the fastest initial speed.

CM 1500 fastest speed = 365 RPM or a touch over 6 revs/s
IIRC dispensing tube ID was ~9mm when I made a ~6mm ID reducing bush to better control extruded powder flow.

 

[Sdupontjr]

Sweet. Close enough. I have some 5/16 thin brass tubing that is used in the video but that motor is only about 180 rpm. Almost twice as fast. They have one 350 rpms. I can ride with that and adjust accordingly. Because the next one is 420

 

[Homerange]

Sweet. Close enough. I have some 5/16 thin brass tubing that is used in the video but that motor is only about 180 rpm. Almost twice as fast. They have one 350 rpms. I can ride with that and adjust accordingly. Because the next one is 420

I'm thinking the CM is belt drive rather than direct drive.....

 

[Sdupontjr]

Mine is direct drive. But with the PWM controller (like a rheostat) i can control whatever speed i want. Incase the belt drive is geared different.

 

[Homerange]

I think the slowest speed which is just a twitch might be the hardest to get right.
Interested to see your results........

 

[Sdupontjr]

Actually that's the easiest. In my case, it's not the twitch. I can slow that 350 rpm motor down to about 10 rpms if need for slower control. Then have a separate bump switch if needed. Just waiting on motor to arrive.

 

[whatsupdoc]

Not sure but is that a mechanical limit switch on the scale the the beam contacts
to stop the motor?

 

[Sdupontjr]

It's a NPN sensor. Basically like an optical sensor. That is the older design in the video. Working the kinks out of the better design. But yes a NPN sensor.

 

[TTE]

Mine is direct drive. But with the PWM controller (like a rheostat) i can control whatever speed i want. Incase the belt drive is geared different.

Nice ..... but it's too big