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Post by rockjunquie on Aug 1, 2017 15:55:30 GMT -5
Definitely keep us posted on the blade results- as well as the build. Thanks! I think I need a new 60 grit- s l o w going! I will. I plan on posting a demonstration video when it's all finished. I will focus on the super grinder wheel. I had a thought and forgot to say it in my last post - the main reason I'm building this is to provide some relief for my battered wrist and hands. My 60 is slow too even though I keep it dressed nicely and the strain of my thumbs pressing against it grinding an agate dome is more than I can handle at times. If I can speed up the process and provide more support for my wrists and forearms then that will be reason enough. Well, I certainly hope that wheel works out for you. Sounds like a great solution for you- that and a custom made grinder to suit your needs. The world needs Tommy Lay cabbing!  |
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Tommy
Administrator 
Member since January 2013
Posts: 13,013
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Post by Tommy on Aug 1, 2017 17:12:54 GMT -5
The world needs Tommy Lay cabbing! Unemployed Tommy Lay needs Tommy Lay cabbing too!  |
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Post by 1dave on Aug 1, 2017 17:52:58 GMT -5
The world needs Tommy Lay cabbing! Unemployed Tommy Lay needs Tommy Lay cabbing too! Unemployed? with 8,000 RTH'rs driving you, you don't have time to belch. |
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 1, 2017 18:18:15 GMT -5
semi-retired?
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RWA3006
Cave Dweller 
Member since March 2009
Posts: 4,703 
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Post by RWA3006 on Aug 1, 2017 20:30:41 GMT -5
I've gotten the impression there is a blade brand/model that is to be recommended for this super grinder. Any insights to share where I might obtain some? Thanks.
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Post by 1dave on Aug 1, 2017 21:47:59 GMT -5
I've gotten the impression there is a blade brand/model that is to be recommended for this super grinder. Any insights to share where I might obtain some? Thanks. Lynn - zarguy - once bought a pile of blades for our local club. I'd ask him. |
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Aug 2, 2017 13:10:53 GMT -5
I've gotten the impression there is a blade brand/model that is to be recommended for this super grinder. Any insights to share where I might obtain some? Thanks. Lynn - zarguy - once bought a pile of blades for our local club. I'd ask him. I bought various 7" blades from liquidators on eBay. They were mixed brands. The price was between $2.60 - $3.20 per blade. Someone had 5 for $10 plus shipping. I asked if he had larger quantities & we went from there. I bought at least 122 of them for myself & other club members. My supergrinder is a stack of 17 blades - it's 1 5/8" wide. Lynn |
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,703
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Post by RWA3006 on Aug 2, 2017 21:43:44 GMT -5
Looks like I better get busy and build one of these for myself. Thanks for the inspiration everybody.
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Post by 1dave on Aug 3, 2017 12:10:13 GMT -5
I glued some wood to the back of an X-ACTO blade extending 1/4" beyond the point to guide the blade through the tube. Be sure to slit the tube along the inside, outside, or side of the natural curve so it best matches your need.  Installing the tube.  |
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,703
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Post by RWA3006 on Aug 3, 2017 18:30:47 GMT -5
Dave, nice touch with the tubing. What kind of glue did you use to glue it on, and were you satisfied with it's adhesion? Thanks. Randy
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Post by 1dave on Aug 3, 2017 21:46:04 GMT -5
Dave, nice touch with the tubing. What kind of glue did you use to glue it on, and were you satisfied with it's adhesion? Thanks. Randy Still working on it. Just use super glue. E6000 takes so long to harden. If I get out back I'll see what it looks like in the morning. |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,663
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Post by jamesp on Aug 4, 2017 13:19:42 GMT -5
What RPM will you turn it Tommy ? Looks like 1:1 pulleys, is that a 1725 RPM motor ?
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 4, 2017 15:13:34 GMT -5
What RPM will you turn it Tommy ? Looks like 1:1 pulleys, is that a 1725 RPM motor ? Correct you are sir. |
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 4, 2017 15:23:35 GMT -5
Update 8/4 Almost finished - it's spinning smooth as silk and quieter than I anticipated. I left as much space between the super-grinder and the 60-grit for reasons that should be obvious ... that SOB scares me. I can almost here it growling "feed me!"  I ended up going closer to the center for the right side wheels because the expando wheel needs more space on the side to change out the belt.   I used a stack of heavy washers on the right side to help offset the weight difference with the left.  |
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kevin24018
spending too much on rocks
Member since February 2012
Posts: 284
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Post by kevin24018 on Aug 4, 2017 15:30:21 GMT -5
does the pressure of the nuts on the end, washer and spacers keep the wheels from slipping or do they have some kind of set screw?
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 4, 2017 15:34:29 GMT -5
Hi Kevin, it's entirely pressure from the nut - transferred through the white PVC spacers. The bearings use a collar and set screw to fasten to the shaft. It doesn't require very much force on the nut to get it to where the wheels cannot be spun on the shaft by hand.
Edited to add: on the left side where the blades are on the 5/8" section at the end of the shaft, I had to leave the PVC long so it overlapped the 5/8" section, then installed a large washer with a 5/8" ID to transfer the force from the saw blades to the PVC.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,663
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Post by jamesp on Aug 4, 2017 16:24:17 GMT -5
That's a wicked device. Does it to take a while to coast to a stop ?
Was there a reason for putting the stacked blades outboard instead of inboard, perhaps mud management access or you turned the end of the shaft for a smaller hole in the blades ?
I suppose the 60 grit wheel does a 1 inch shaft and has a key, the blades have a 5/8 inch hole and 5/8 nut holding them against the step in the shaft.
I am having great success with a 1/4 inch thick 7" tuck diamond blade on the tile saw. A direct bolt on.
I like the 1/4 inch wide Advanta tuck blade. It has a 1/2 inch face on the side.
Wish it were wider(or taller as it is). You can grind aggressive on the 1/4" face and do flat work on the side.
The blade is of course bolted directly to the short shaft of the tile saw motor.
Table can be tilted or left flat. Blade can be lowered so that only a bit of it is exposed.
The blade picks up water from the pan and is managed fairly well by the baffles in the tile saw.
Better to feed water to the pan as the wide blade draws it off fast. So a bit messy. Needs full base pan to catch all drip.
There is no heavy rotating weight at the end of an extended shaft, damn if my King Kong grinder would start to vibrate when blade got worn to an out-of-balance situation.
Most tile saws come with a whole 1/2 HP motor and they turn at 3600 RPM. But very balanced with the nubby short shaft.
I choose to wear one blade out at a time and deal with the smaller contact point. Wide contact points cut slow, narrow ones cut fast.
Pressure can be applied to increase cutting rate on a wide contact point but it can damage the sintering in that it glazes it.
If the blade does get worn unevenly it is trash. Not just from an imbalance standpoint, but an out-of-round situation which causes rock to bounce. So I choose to not gang blades.
Spinning those diamond blades at 3600 RPM brings another dimension to removing material. 1800 or 3600, like falling 10 stories or 20 stories. About equally as dangerous.
When using a wide contact point on the 1/4 HP King Kong grinder(geared up to 2300 RPM on a 1725 motor the friction would slow the motor fairly easy. 1/2 HP about right.
Especially with heavier ganged blades as it took a while for motor to get back to rated speed.
Mind you I ground a lot of rocks to feed 15 and 20 pound tumbler barrels. It was harsh duty and a lot of grinding.
I also feel that the ganged blade should be run as an independent shaft and motor. In case vibration is present, plus the mess.
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 4, 2017 18:39:12 GMT -5
That's a wicked device. Does it to take a while to coast to a stop ? Was there a reason for putting the stacked blades outboard instead of inboard, perhaps mud management access or you turned the end of the shaft for a smaller hole in the blades ? I suppose the 60 grit wheel does a 1 inch shaft and has a key, the blades have a 5/8 inch hole and 5/8 nut holding them against the step in the shaft. It does take a veeeery long time to stop lol. I wish I could tell you I had a specific reason for turning the blades that way but I don't. Just keeping them all going the same direction. |
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Tommy
Administrator
Member since January 2013
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Post by Tommy on Aug 4, 2017 18:50:15 GMT -5
It will take a while to smooth out all the wrinkles and start getting used to a new machine but I'm calling this one finished. rockjunquie I added the video I promised you to the bottom of the first post. |
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Post by wigglinrocks on Aug 4, 2017 18:52:32 GMT -5
Great job on the build . Love it when a plan comes together .
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