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28LikesThread: Variable speed control.
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02-10-2015, 04:50 PM #1Senior Member
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Variable speed control.
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I scooped this up for free. Can I use it to control a electric motor to make it variable speed. Thinking of making my own belt grinder.
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02-10-2015, 05:17 PM #2At this point in time...
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It depends on the Motor
Chevhead likes this.
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02-10-2015, 05:23 PM #3Senior Member
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Then I guess the question is what motor to put with it.? I have someone on Craigslist locally with tons of electric motors for sale
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02-10-2015, 05:28 PM #4At this point in time...
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Variable-frequency drive - Wikipedia, the free encyclopedia
It just isn't as cheap or easy as you would think
Brad/Undream has a really good thread on here about his Grinder build that you will want to read also.. He goes through the issues the he had to deal with as he home built a grinder...Geezer likes this.
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The Following 2 Users Say Thank You to gssixgun For This Useful Post:
cudarunner (02-25-2015), Geezer (02-10-2015)
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02-10-2015, 05:30 PM #5Senior Member
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I have heard that. But got something for nothing so just researching now
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02-10-2015, 05:45 PM #6At this point in time...
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http://straightrazorpalace.com/forge...r-project.html
That is a good read
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02-10-2015, 06:37 PM #7Senior Member
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It has to do with the eventual application of the motor you're trying to control. A lot of motor controls are rheostats which control the rpms of the motor by (really basically) cutting the power to the motor. For a grinder, you need to keep the power or else you'll stall your wheel out at the lower levels. I have heard that you can use the controls off a treadmill though! Other than that, VFD is the only way to go.
Geezer likes this.Let me know if you need any help with shaving, honing, etc.
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02-10-2015, 10:00 PM #8Senior Member
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VFDs are good, but if you don't know how to use them, you should get a professional to do the electric work on it. You can fry a motor pretty fast if you don't know what you are doing, it is really easy to screw up, trust me
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02-10-2015, 11:29 PM #9Senior Member
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well, by the looks of this and my thinking . it's onto a pulley system to control speed . OR take the major plunge into a kmg grinder . my sister has a ton of scrap metal . and 2 welders and i have nephews who know how to weld . the plans for the grinder on this site look good so who knows what a weekend can bring
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02-11-2015, 12:24 AM #10Senior Member
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LOL. Yes it is. I am currently looking for a new 5 H.P. 1720 RPM motor for my dust collector.
Originally Posted by jeness
VFDs are good, but if you don't know how to use them, you should get a professional to do the electric work on it. You can fry a motor pretty fast if you don't know what you are doing, it is really easy to screw up, trust meIt's not what you know, it's who you take fishing!
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