×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Relatively inexpensive 25:1 for 1 hp motor

Relatively inexpensive 25:1 for 1 hp motor

Relatively inexpensive 25:1 for 1 hp motor

(OP)
Hey all,

I'm building a prototype of a new product and I need to reduce the speed of a 5400 RPM, 1 hp brushed DC motor by a ratio of 25:1. It needs to be bi-directional (i.e. no worm gears). I found a 25:1 two-stage planetary gearset from QC Gears with an appropriate torque rating, but it costs over $800. I'd like to do it for significantly cheaper, if possible. That price would ruin the target price of the product. For reference, my first prototype iteration used a 5000-lb winch with a 1 hp motor and a 3-stage planetary gearset that cost $200 total on Harbor Freight.

In addition to planetary gears, I was also considering using a toothed belt for the first stage and spur gears for the second stage. I also might consider contacting automotive drivetrain manufacturers, since they manufacture helical planetary gearsets that are much cheaper than industrial power transmission (although potentially harder to integrate).

Any recommendations?

Thanks,
Andrew

RE: Relatively inexpensive 25:1 for 1 hp motor

Some HF stuff is okay, but I wouldn't use it as a yardstick.

What I'd do now is drag out my Browning catalog and start looking at alternatives.
For two stages, you need a jackshaft, and some structure to hold it. That may change with the ratio split you select.

For the amount of reduction you're looking at, I might consider a chain drive for the second reduction, and maybe a poly-V belt for the first. You definitely need an automatic tensioner for those belts.

Of course at 1HP you could probably do both stages with toothed belts and get to basically zero maintenance. ... and no tensioners if you use relatively coarse teeth and slightly tight tolerances on the center distances and allow axial assembly.



Mike Halloran
Pembroke Pines, FL, USA

RE: Relatively inexpensive 25:1 for 1 hp motor

Oh.
I almost forgot.
The cheapest alternative may be to call Bodine and have them build the exact gearmotor you need, and deliver it ready to install.

Mike Halloran
Pembroke Pines, FL, USA

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources