RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 26, 2012 6:42:15 GMT -5
Being off work with knee surgery, I completed my expando project. There are some kinks to work out, though. I need a larger water shield to protect the motor and something to cover the dangerous shaft on the left side of the motor. The only thing I had to buy was a used expando wheel for $35...the rest was parts I have collected from other ventures. Please feel free to give me pointers on anything that looks wrong.    |
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Post by johnjsgems on Oct 26, 2012 8:22:56 GMT -5
Looks good. Enclose the left side of hood with either plastic or sheet metal. You could add anoyjer drum to left side if you could find more parts.
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 26, 2012 8:31:28 GMT -5
John:
The motor is a 1/3 hp Emerson, is that enough to add, maybe, a buffing wheel to the left side? I know nothing about electrical stuff. I rewired the plug to add an on/off switch (made from a cheap power strip)
The orange thing is a piece of plexi to protect the motor, but there is more overspray than I anticipated. I will need to mount the water shield to the motor mount because I made the hood easily removable to facilitate belt changing.
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Post by johnjsgems on Oct 26, 2012 9:46:45 GMT -5
The hood should have only one bolt in back to hold it down. You could still enclose the left side and notch to fit over shaft. Lift the whole thing straight up. I would leave the orange disc too. You could mount a polish head on left side of motor. What is the rpm of motor? 1725?
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keystonecops
freely admits to licking rocks
Member since October 2010
Posts: 957
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Post by keystonecops on Oct 26, 2012 10:24:26 GMT -5
I'm off work with a hip replacement. Too bad ya aint closer, we could combine forces. Purty good enginering. Later Clyde
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gerard
starting to spend too much on rocks
Member since April 2011
Posts: 218
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Post by gerard on Oct 26, 2012 10:40:32 GMT -5
Looks like it will work well. enclose the motor with a plastic bin that will also cover the left dangerous shaft.
What is it and how is the shaft that the expando is mounted on atatched to the motor?
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Post by johnjsgems on Oct 26, 2012 14:51:44 GMT -5
Looks like left shaft is threaded. If so right side is also. That is why I asked about rpm's. Bench grinders use similar double shafted motors and most are 3450 rpm. Too fast for expando drums.
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Post by Rockoonz on Oct 26, 2012 17:55:55 GMT -5
Enclosing the motor may cause it to overheat. Also the RPM like john said, 3450 WILL result in your expando grenading.
Lee
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 26, 2012 18:47:36 GMT -5
The motor is 1725 rpms (had to check).
The right hand shaft has a collar with two set screws, one side on the motor shaft - the other side has a 5/8" all thread (had to get bushings for the expando).
The left hand motor shaft is round with a flat side (not threaded)
Thanks for all the help....I think I will have to add a polishing head. I could enclose it in a plastic tub when not in use so it wouldn't be a safety hazard.
You guys guys rock!
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 26, 2012 20:14:19 GMT -5
Thanks Clyde...hope you are recovering pain-free!
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quartz
Cave Dweller 
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,360
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Post by quartz on Oct 26, 2012 21:30:56 GMT -5
You've got a nice, clean unit there, my compliments. One thing that concerns me is the open wiring connection containment. I have purchased several used motors over the years, several powering grinding/ polishing equipment that are missing that little cover; makes me real nervous to be that close to the electricity. I make covers out of thin white nylon [like cutting board mtl.], but only about 1/8" thick. The stuff is easy to cut, and non-conductive.
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Oct 26, 2012 23:38:55 GMT -5
what you can do as far as the water shield goes is to have a piece of 1/8 inch plexiglass bent at a 90 degree angle to cover the side of the unit and wrap around to cover the front of the motor. Make it as high as the top of the cover of the expando, use the same mounting area as the orange cover you have now and you shouldn't have any problems after that.
If you're going to add a polishing wheel on the other side you could have the plexi done it a "U" shape to enclose the front of the motor and both sides to help protect the motor while still allowing air to circulate & cool the motor.
I just had something similar done for my 8 inch trim saw I am redoing to protect the motor and electrical connections from any possible over spray. I'll post of pic of it tomorrow so you can see it.
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hubrocks
fully equipped rock polisher
Member since April 2011
Posts: 1,563
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Post by hubrocks on Oct 27, 2012 1:57:16 GMT -5
Nice job on that!!.......Hub
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,663
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Post by jamesp on Oct 27, 2012 3:03:58 GMT -5
That is a handsome machine.Attention to detail noticed.Keep in mind that industrial AC units are constantly being torn apart in salvage yards.These units often have odd RPM motors.Most common is 1000 RPM at 1/8 RPM. About perfect for many lapidary projects.Make sure they are 110 volt AC and not 277 volt or 3 phasers. I was nervous using 1/8 HP 1000 RPM er for tumbler turning two 12 pound drums.It seems on the edge but has never overheated in 2 years.
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paule
off to a rocking start
Member since October 2012
Posts: 2
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Post by paule on Oct 27, 2012 11:34:08 GMT -5
I have the rock/gem cutter use by Wm. J. Bingham which I found in my parents basement after my mother passed away. If you or anyone else is interested, would love to sell it to someone who could use and appreciate it.
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 27, 2012 19:46:12 GMT -5
Good idea on covering the terminals, Quartz. That was bothering me, too.
Mario, a picture would be great.
Thanks, Hub. I enjoy building things, but sometimes my ideas aren't as good as I think they are.
James, I think this motor was from an appliance in it's former life. It's an Emerson. Thanks!
Paul, you may want to post in the 'shop and swap' section.
Off to research buffing wheel fabrication....the project saga continues...
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Post by johnjsgems on Oct 27, 2012 21:16:31 GMT -5
If it is a smooth shaft you can buy a smooth bore aluminum polish head to fit that attaches with set screws. Covington makes them in all sizes and not too expensive. Tony (catmandewe) had a big load of polish heads he bought I think two years ago so check with him first. Making a head and attaching to a smooth shaft and having everything true and vibration free could be difficult.
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 27, 2012 22:14:49 GMT -5
Thanks John.
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Oct 28, 2012 0:18:35 GMT -5
weather was a little rough today, will post in morning.
Mario
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RockIt2Me
has rocks in the head
Sometimes I have to tell myself, "It's not worth the jail time."
Member since December 2009
Posts: 668
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Post by RockIt2Me on Oct 28, 2012 7:55:35 GMT -5
From what I have been reading, 1725 rpm's may be too fast for a buffer.
I found a 'read speed data chart' on bringing the drive pulley size and the driven pulley size together for given RPM.
The haunting question is...What is the optimum rpm's for the buffer?
This is surpassing my comfort zone, because now I have a shaft, pillow blocks, pulleys, drive belt, and alignment to worry about.
But I love a challenge.
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