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  1. binfordw

    Need help figuring speed

    Thanks guys, not sure where I went wrong with the math. Looks like I'll be using a jack-shaft after all. This site is great, thanks for all the help Ben W
  2. binfordw

    Need help figuring speed

    Hi all, I have a question. I need to figure out what sprockets to use to achieve a set speed on a project. Heres the basic info, 2750 rpm motor 10" drive wheels target speed, 7-10 mph. I cant seem to figure out what the drive axle rpm needs to be to achieve those speeds...
  3. binfordw

    Selecting a small DC motor?

    I just remembered my other question.. How would upping the voltage, say from 12 to 24 affect these formulas- if at all? A certain motor I was checking into has a 12v and a 24 volt model,, and about the only difference is the 24v model has a LOWER stall amperage... Almost half the amps at...
  4. binfordw

    Selecting a small DC motor?

    Oh good. I was confused over that one. I did some calculations with different grades and different rpms, that worked very well, and is a great help. If I need it to be able to climb a 45 deg. grade, and the amps at stall is 36, is there some kind of limit I should consider? Like a percentage...
  5. binfordw

    Selecting a small DC motor?

    Thanks for your help, I do have a question tho, "110 X 1 X 2 x pi = 1068 inches per minute," I cannot get these numbers to work.. Is there a typo? I keep getting 110 x 1 x 2 x pi = 690.8. The Idea so far is to use 6" drive sprockets. I'd like to acheive around 5 to 10mph max speed with...
  6. binfordw

    Quick question

    If I want to figure speed, and know the drive- output RPM, and the wheel diameter how do I find mph speed? I tried this (RPM*tire dia. /336)= mph example- 85*6"/336 = 1.51 mph... (?) it seems to work from what I can calculate, but is there a better way- or whats a way to double check?
  7. binfordw

    Selecting a small DC motor?

    Anybody? Hmm. Maybe I should revise my question a bit. What I need to know is how much work the above gearmotor is capable of doing. How do I figure how much weight can be moved with this motor(actually 2 of them), and is there a way to formulate current draw at a specified load? IF the...
  8. binfordw

    Selecting a small DC motor?

    Hello, I am working on another project, and once again am a bit stumped on how to pick a dc motor for my application.. I am making a RC tank, 40" by 26", weighing about 140 lbs complete. It will use 2 motors, one to drive each track.. I have found various small gearmotors, but am not...
  9. binfordw

    Figuring required motor torque for rolling load

    Thanks guys, that is the info I was looking for. To clarify a bit, I am using 10" pneumatic rubber tires to roll these carts. I am using bearings on the drive axle. I do have a question though, 1/2 hp sounds right, but 250 + ft lbs?? That seems really high to me. Another question...
  10. binfordw

    Figuring required motor torque for rolling load

    I need help with this. I need to find out how much power/ torque is required to move a rolling load up a 25 deg. incline. I need a drive motor for a electric cart. The cart weighs approx 1200lbs, and needs to travel only around 20 to 30 fpm. Anybody know a way to figure out how much torque...
  11. binfordw

    DC motor, torque ratings

    Hi, I need to find out how to select a 12 to 36 volt dc- gear reduction motor for a project. I need one capable of pulling a 1200 to 1500 lb pit cart (tool box) around at a very slow speed. I have no idea how to figure out how much torque/ power will be required for this. I am using a...

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