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Home made 6 inch lap

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Author Topic: Home made 6 inch lap  (Read 457 times)
55fossil
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« on: January 08, 2016, 06:17:47 pm »

    Built this for under $50, could have done it for much less with a used motor. The motor is really key to good lapping so I bought a high quality 1/3 HP reversible motor. I attached it to a metal plate which I mounted into a wooden base. I put a wooden top over the metal plate so I could seal the water out. Added a commercial drip system. Simple hole and tube to drain the waste water into a jar. The lap base (master lap) was $23 new. The wood got multiple coats of varnish and a bead seal of caulk around the top. I put the on/off switch on the cord so I could keep it away from the water. Make sure water cannot run down the cord to the switch. Almost forgot to mention the shaft adapter.
     Well, I have used it for years and never finish it. The duct tape really keeps the water from splashing out. I will replace this with rubber someday... ha. I have never added a switch to reverse the motor either.  Anyway, you can see how easy this is to build.   neal


* lap3.jpg (273.7 KB, 1000x1000 - viewed 30 times.)

* lap6.jpg (277.03 KB, 1000x1000 - viewed 17 times.)

* lap4.jpg (279.21 KB, 1000x1000 - viewed 14 times.)
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Debbie K
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« Reply #1 on: January 09, 2016, 08:28:10 am »

Great! I was discouraged by others to try this approach years ago; was told that the motor wouldn't "like" the angular stress placed on it, that I'd need to use bearings and belts. Good to see that it works and has for years.

One question: Please tell me that there is a GFI somewhere? Water and electricity don't mix well.

Debbie K
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slabbercabber
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« Reply #2 on: January 09, 2016, 08:53:02 am »

GCFIs don't like motors.  It is certainly a good idea but if you add one, get a heavy duty unit, not some Harbor Freight junk that will keep you frustrated.
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55fossil
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« Reply #3 on: January 09, 2016, 06:37:25 pm »

   GFI's???  Oh heck yes.  Every outlet in my shop is a GFI. Thanks for bringing it up though. They say you can daisy chain all your switches off one GFI but I trust nothing. cheap insurance.
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Ranger_Dave
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« Reply #4 on: January 09, 2016, 07:38:42 pm »

I have one GFCI in my shop, and all the other outlets come after that one. I've tested the last outlet in the line (with the proper tool), and it tripped the GFCI instantly. Just make sure the GFCI outlet is rated at 20 amps or your motorized tools will trip it.
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Fegbri
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« Reply #5 on: January 10, 2016, 08:06:42 am »

What kind of motor and where is good place to buy?
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Ranger_Dave
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« Reply #6 on: January 10, 2016, 09:57:52 am »

I like swamp cooler motors for this kind of stuff. Not that I'm an expert on making flat laps, but the swamp cooler motors are designed for damp environments. Home Depot has a 1/2 hp for $80. Dual speed too, if you want to slow down for softer materials.
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55fossil
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« Reply #7 on: January 10, 2016, 11:13:13 am »

     I purchased mine through Grainger's because I use to be able to buy at cost plus 10%. The vertical shaft motor is needed so you do not need pulleys and belts. It can be hard to find a good vertical shaft used motor. As long as you seal up your box and use the GFI any good motor with 1750 RPM should be fine.  google  google
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