Automating bullet sizer?

[Tazza]

This one may be best for someone with more brain cells than me to confirm then. My logic was the 1/2HP is twice the power of the 1/4, the difference between the reduction is about 30% with my maths, 1 + 1 = 7 right?

70 RPM still seems a little too fast for me, but it may work just fine for you. I have the occasional issue of moving too fast and the projectile doesn't quite have enough time to fall from the feed tube into the slider or the slider to the sizing die and catches. It doesn't happen often, but something that if it ran a little slower may not occur.

[igolfat8]

The output power is measured in torque. Whichever one has more torque is the winner.

[Cue]

Which leads back to my question which one of the two Motors would have more torque?

[Tazza]

So, looking on the internet, how true this is or not i don't know but....
https://sciencing.com/measure-electr...e-7810276.html

With those figures i get:
1/4hp gives .761 ftlbs
1/2hp gives 1.862 ft lbs.

With the reduction box, assuming no losses so they are compared the same:
1/4 hp gives 22.83 ft lbs due to a reduction of 30:1 so multiply it by 30.
1/2 hp gives 37.24 ft lbs due to reduction of 20:1 so multiply by 20

I have no idea if i math well enough to get those figured right or not, but the website is there to see if you can math better to get a figure that seems ok.

[Cue]

Thanks for that site. The only thing that throws a wrench in it is the label on the gearbox of the 1/4 hp says 485in pounds which is 40 foot pounds of torque.

https://www.ebay.com/itm/Ohio-Gear-B...72.m2749.l2649

[Tazza]

Hopefully the 40 lb on the plate just means max input torque?

[Conditor22]

Wondering if a hole hawg drill with a speed adjustment screw/strap attached to the trigger would work

[Tazza]

Depending on the wattage and gearing, it might. The only issue i see is if it's running at a lower speed for a longer time, the cooling might not be enough.

Brushed motors are generally louder too.

[igolfat8]

There should be a label on the gearbox that shows the output torque.

[Cue]

There should be a label on the gearbox that shows the output torque.

Most of them do not have output torque on the label but the one you bought, and the one I linked above does, but it does not match with the math that the site above says used to calculate the torque which is what we were discussing.

[Tazza]

I'd still think the torque on the gearbox will be maximum torque, as they are generally modular, so you mount whatever style and size motor you want for the application.

With the motor and gearbox i got off a mad mate, he said if the motor doesn't have enough power, we can for a larger one to it as its an ISO mount so just swap motors to do whatever job you want. I think it would be quite rare for an electric motor manufacturer to make motors and gear boxes, they'd generally do one or the other. In a shop, it makes sense to have them separate as you can choose the motor, then choose the box, means they can keep far less stock on hand to mix and match. At least, that's how i'd do it.

[Ausglock]

Motovario make motors and worm drive gearboxes.

[Cue]

I bought the same motor igolfat8 did and after some reworking and making new parts, and a fresh powdercoat of the frame it is now done. This motor is a lot larger than the other one I was using and has plenty of power, I was even trying some small .380 and one got in the die sideways and it just sheared it in half, so no problem with the .45's I was having trouble with.
Here is a video
https://www.youtube.com/watch?v=y6bE...ature=youtu.be

[Tazza]

That is awesome!

Shame mine isn't that pretty..... It mostly does the job, but looks like a hobo built it

[Ausglock]

good job.

[Cue]

Thanks guys, it is working very well now.

[mozee]

So I’ve been fairly quiet. Been very busy to read or comment on the forum. It’s been a hectic 2 months as I am involved in the 3d printing business and we had 2 major exhibitions to attend, one weekend after another. Glad to say that tonight was the last for a good few months and I can now focus on bullets.

In any event, I commissioned a very good friend of mine who has a double garage full of machinery. At first it was a simple request to help me with the pulley etc but as he looked at my requirements, he was interested in building the complete thing, including wiring the VFD etc.

If you recall, I purchased a 3 phase 1400rpm motor with a 50:1 box. I dropped this of flat with the VFD and the sizing machine as well as several videos and pictures at his place about 2 weeks ago. Today he sent me a few videos of it running and I am very impressed with it thus far. We plan on running a few bullets this week, but I am fairly positive it’s going to work as expected.

I should add that we looked at the linkages of the sizing machines and changed some of the Magma clevis’ to bearings. You can see it in the video.

Any comments are welcome, please.

https://youtu.be/Q3HThbhTfc8

https://youtu.be/TeBq2Yg2s0A


Sent from my iPhone using Tapatalk

[Cue]

Very nice and simple, I like it!

[Dragonheart]

I automated my sizing years ago using an air cylinder and I can do about 2K an hour. Unfortunately, this is a project that requires a good bit of tools and expertise to put together.

[igolfat8]

I’m still waiting on my AS2 to ship.