hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Feb 11, 2022 12:20:03 GMT -5
I'm a newbie and this post may be a repeat. Forgive me if it is because I'm new to this forum and I'm not sure if I'm doing things right. I bought one of those green, cast iron, 6 inch, flat laps on ebay, that are made in China. It runs extremely fast, at about 2400 or 2800 mRPM. Way too fast. I thought I could use a rheostat to slow it down but found out later that the rheostat could make the motor burn up. There must be some way of slowing this thing down safely. I'm not electrically knowledgeable and all I know about electric stuff is that if you put your finger in a light socket it's going to hurt.
Can anyone give me some help on how to make this work at a reasonable speed. I believe the turntable (backing plate) is directly attached to the motor. There's no pully to change speed. I'm a senior citizen on fixed income so I have to make the best of what I have. I admit, in hindsight, that it was the wrong machine to buy, but now I have it and financially need to make it work. I use it for shaping rough stones with diamond discs. The speed is eating up discs at a rapid rate.
Since I'm new to this forum, could any responses, fix's, or suggestions be emailed to me as well as posted on the forum. My email is jpmlholian@aol.com. There must be others who have this same problem. I'd like to know what they did to solve the problem. If anyone knows of any parts that will work, could you include manufacture name and part number, if you know them.
Thanks for your help,
Jim Holian
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Post by rockjunquie on Feb 11, 2022 12:31:33 GMT -5
Welcome, hoolligan1938! I am going to move your post to another section for you.  |
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rockbrain
Cave Dweller 
Member since January 2022
Posts: 3,120
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Post by rockbrain on Feb 11, 2022 13:18:48 GMT -5
Unfortunately I don't believe there is a solution. If it's not a speed controllable motor there's not going to be any way to do it other than change the motor to a slower one.
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Post by Rockoonz on Feb 11, 2022 13:39:57 GMT -5
@hooligan1938 if you could send a link to a product page or provide a model number? If you get a water additive like what if used for trim saws and add at about 1/2 the strength used for saws, it may help. I use the additive for drilling and increase my drill life by quite a bit.
I fear that centrifugal force is causing the water to not stay on your laps.
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vwfence
has rocks in the head
Member since January 2013
Posts: 566
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Post by vwfence on Feb 11, 2022 16:26:41 GMT -5
you can buy a reostat type switch at harbor freight . It may not be recommended for some motors , but i use one on a buffer / polisher and its worked for a yr or so
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hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Feb 11, 2022 19:29:19 GMT -5
Gentlemen - Thank you very much for your input. I do have a product called "Water Aid" made by Diamond Pacific. It's called a wetting agent. It say's to use 6 drops per pint of water. This product makes me think of an item called "Water Wetter" made for use in automobile radiators to help cooling. Don't know if it would work or not. I might just have to change motors but not being electrically oriented that might be a problem for me. I don't know what kind of motor I would have to buy. The unit I have does not show any manufactures name or model number. It's made in China and has some Chinese markings on it but that's all I can find.
Again, thank all of you for your input. At least I now have some ideas to think about. Any other ideas are certainly welcomed.
Jim
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hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Feb 11, 2022 20:00:10 GMT -5
rockjunkquie - Thank you again for the help. I did a few explorations and must have hit the right button and found the replies. Thanks again,
Jim
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Post by hummingbirdstones on Feb 11, 2022 22:05:35 GMT -5
Hi Jim and welcome from Northern Arizona! I can't help with your problem because I know about the same as you when it comes to electric stuff. I do want to suggest that you edit your original post and change your email address by taking out the @ sign and put the word at in instead. That will make it unclickable and stop any scoundrels who are trolling around from swiping it and then sending you more spam about unsavory things than you can shake a stick at.
I hope someone can help you with a solution.
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quartzilla
Cave Dweller
Member since April 2020
Posts: 1,238
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Post by quartzilla on Feb 11, 2022 22:47:51 GMT -5
Trying not to hijack a thread here but is there a recommended speed for thes flat laps depending on the material and what your trying to do? I’ve been messing around with my Cristalite 6” Crystal Master flat lap trying to learn how to use it. It does have a speed control but it’s just a dial with no numbers/settings on it.
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hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Mar 3, 2022 15:11:41 GMT -5
How about the "water wetter" - anyone used it for diamond wheels or disc's? Rockoonz - what is the additive that you used for extending the life of your drill bits? You didn't mention a brand in your posting. Would love to hear what it is if it really works.
Jim
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Post by Rockoonz on Mar 3, 2022 16:39:27 GMT -5
How about the "water wetter" - anyone used it for diamond wheels or disc's? Rockoonz - what is the additive that you used for extending the life of your drill bits? You didn't mention a brand in your posting. Would love to hear what it is if it really works. Jim Lube cool is what I use. It's a Johnson Bros product, I got it at the local rock shop in WA. |
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Post by opalpyrexia on Mar 3, 2022 16:44:49 GMT -5
How about the "water wetter" - anyone used it for diamond wheels or disc's? ...
I use Finish Jet-Dry.
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Post by pauls on Mar 3, 2022 20:58:00 GMT -5
Jim. Welcome to RTH from Australia.
I doubt the speed is what is eating up your disks, Fast is good. Cheapish plated laps like used for faceting don't last long, The Chinese ones are usually OK.
Having been the maintenance man at a club I can tell you that pushing hard will destroy wheels and laps and saw blades quicker than anything. We always tell newbies to just let the diamonds do the work, but as soon as you turn your back they are pushing as hard as they can.
As for your wetting agent, try a few drops of dish detergent.
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Post by rmf on Mar 4, 2022 3:55:20 GMT -5
if you can't change the speed of the motor, change the diameter of the pulley. Use a smaller pulley on the motor and a larger pulley on the bottom of the plate.
or change the motor to a variable speed motor.
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Post by Rockoonz on Mar 4, 2022 8:41:22 GMT -5
if you can't change the speed of the motor, change the diameter of the pulley. Use a smaller pulley on the motor and a larger pulley on the bottom of the plate. or change the motor to a variable speed motor. I believe he is talking about a direct drive unit with no belt. |
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hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Mar 5, 2022 19:30:04 GMT -5
Rockoonz - You are so right. The machine I have is a direct drive. I'll learn to live with the speed. Opalpyrexia - You say you use "jet dry" as a coolant and lubricant? Is that the stuff (for lack of a better word) that you use in a dish washing machine? Enlighten me on the pro's and con's of using that, please. I'm always open to new idea's that work. To everyone, thank you for your input. It's very much appreciated.
Jim
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