More torque

H

Hukshawn

Forum Guest
Register Today
The mini mill. Is there a reasonable way to squeeze more torque out of the stock parts?
It over loads when drilling holes. Even smaller holes.
 
1. Bigger motor
2. Gear (pulley) it down
Torque = power/rpm
 
If you are using a VFD, slowing down the motor is usually ineffective. My Tormach has a 3 phase VFD and is fairly well useless at the lowest speed setting. Using a set of speed reducing pulleys or gears will lower the rpm but will increase the torque proportionally. Motors are usually rated for power at a fairly high speed. You can calculate the rated torque from the the formula torque (lb.ft.) = hp x 5252/rpm. Torque generally does not increase much as you lower the VFD speed.
 
So the short answer is no.

I don't have the greatest drill bits ever made, I was drilling a hole for a 1/4-20, and in the 1" of drilling I had to reset the motor 3 times...
 
No..

Reasonable way to increase the usefulness of the machine is to properly use it within its limits.

Adding a larger motor or altering existing one will create a weaker point somewhere else that may not stall but break.

If stalling drilling holes then check your tools for being fit to work then use only enough pressure or rate of feed to stay within the limits of said tool.

Here the line " let the tool do the work" applies.

Sent from my SAMSUNG-SGH-I337Z using Tapatalk
 
Your mill is not capable of drilling a 1" diameter hole in hard materials. If you insist on drilling large diameter holes, get good drill bits, with split point and web thinned. There are youtube videos on how to thin a web and grind split points. I would think if would be easier to start the hole with small drill, step up in size until you can use boring head and bore the hole to correct diameter. I bet the manual of your mill states largest drill size and I am sure 1" is way beyond its capabilities.
 
It wasn't a 1" hole. It was a .260" hole to a depth of 1".

But I'm getting the general consensus here.
Thanks guys.
 
Shawn,

Are you clearing chips out the hole frequently? If not, they could be binding the bit in the hole, or trying to, and overloading the motor in the process.

Tom
 
That had been the problem once it twice but not always. I may just not be fully aware of the limits of this little machine. Also, i was using the machine for a few hours by that point. The overload circuit might have been weak due to heat. I notice the control box on the back does get warm after heavy usage. I have a small 12v fan I plan on putting in there. I recently bought a 12v gear motor and DC controller to build a power feed. I was planning on putting the controller in the box and knew I'd definitely need a fan to keep things cool.
 
Back
Top