Brass worm gears

Help & Support Robot Parts
1

Does Robotshop sell them?

I need a worm with a 6mm bore for a:
Actobotics 16T Gearmotor Pinion Gear (6mm)

Thanks,
Jim

2

Note that the pinion gear in question is a spur gear, and is not at all compatible with a worm or worm gear. If you can tell us more about your application, perhaps we can provide alternative ideas. If you want a worm system using that type of motor:
robotshop.com/en/vertical-sh … arbox.html

3

Thank you for the clarification Coleman.

I am looking to rotate a large, flat edged disk (1050mm D) in a circle at a rate of one revolution per day. The motor needs to drive the disk from the outside edge of the disk and not the centre. Voltage supply is 12 VDC. Weight of the arc is 35 kilos and the arc is placed 45 degrees from horizontal.

The link you provided to the gear box is a possibility but I would prefer a ¼" shaft.

Your help is appreciated.

Jim

4

Unfortunately that’s the only worm gear system we offer like that. One revolution per day makes for 0.007rpm (assuming 24 hours), so your idea of using a geared motor on the outside of the disk is a good one.

5

Coleman,

Are you able to help me further with this?

As discussed, I have a 1050mm D disk being driven by 19mm D roller from a 12 vdc motor with a 6mm shaft. I need to drive the large disk along it outside edge by about 140mm per hour (137.5 to be exact but this can be compensated for by adjusting the voltage to the motor with the attached potentiometer).

My current geared motor has 3.5 RPM. I am considering a .5 RPM geared motor to make accomplishing the required speed easier. But after this I am lost. I am giving up on the original worm gear scenario and am now considering spur gears. My motor will now be placed in line with the 19mm roller drive shaft instead of perpendicular to it. What spur (pinion?) gears do I need that will get me close to my desired tracking rate of 140mm per hour?

Thank you,

Jim

6

Consider the following combination:
robotshop.com/en/12v-2rpm-14 … RB-Sct-796
robotshop.com/en/vertical-sh … arbox.html

This would provide a maximum of 0.07rpm. Connecting the output shaft to a wheel which is pressed against the larger wheel will act as a gear down. You would need the radius of the small gear to be 1/10 the circumference of the large disk to get an additional effective gear ratio of 10:1, reducing the maximum speed to 0.007rpm. Note that this is without a load, so the actual rpm might be too slow, meaning you should consider a ratio of around 1:5 and use a DC motor controller to manually refine the speed.