jamesp
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Member since October 2012
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Post by jamesp on Mar 5, 2018 19:44:31 GMT -5
Welded a bit on the lapper. Will probably mount the motor on the other side of the bowl similar to drive shaft with motor mount plate perpendicular so belt can be tensioned. Legs. Bracing the drive shaft mounting plate so it is rigid.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,656
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Post by NRG on Mar 5, 2018 23:30:47 GMT -5
Can't weight to see the stand.
As an aside, I used the angle jig you made me, at class tonight. The boss was quite impressed. Thanks again.
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jamesp
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Member since October 2012
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Post by jamesp on Mar 6, 2018 4:56:55 GMT -5
Can't weight to see the stand. As an aside, I used the angle jig you made me, at class tonight. The boss was quite impressed. Thanks again. Did what you told me, glad it worked for you. Made one for myself. Thanks for the idea. With all that rotation stuff attached to the bowl the stand will be used for bracing to reduce vibration of the low point of the motor and bearing mounts. That cantilevered mounting design will likely vibrate without further bracing. To mount a lap on a standard height table the motor is best mounted in the table like Chuck and Tommy did. I need this one portable for cold and warm weather locations and outside for messy grinds. And in the deer stand - kidding. Found a 1040 RPM 1/6HP motor. Like the low RPM, should have enough power. Allows smaller main pulley... Trying to decide 1/4HP 1725 or 1/6HP 1040....just grinding small pieces..... UPS says aluminum backer plate was delivered yesterday. Waiting for abrasive discs(60-220-600-1200) via E-packet China. $12 each. Primary task for this machine is to remove back of glass melts. See how they curve inward on back side. Need to remove 1mm for a cab-like girdle. And they are also a bit thick at 6 to 7mm.
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Mar 6, 2018 12:29:08 GMT -5
looking good James! I always enjoy seeing homemade equipment.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,656
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Post by NRG on Mar 6, 2018 14:38:34 GMT -5
It's already almost 3pm EST and this machine isn't finished. I'm officially disappointed....
[kidding]
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 15:31:54 GMT -5
It's already almost 3pm EST and this machine isn't finished. I'm officially disappointed.... [kidding] Kilns running, fire pit bowls arriving, tumblers loaded to the hilt, dog breeding going on, just too much to do this moment. Going to tinker a bit shortly, see if more can be done. Funny you noticed the dragging feet.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,656
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Post by NRG on Mar 6, 2018 15:33:12 GMT -5
It's already almost 3pm EST and this machine isn't finished. I'm officially disappointed.... [kidding] Kilns running, fire pit bowls arriving, tumblers loaded to the hilt, dog breeding going on, just too much to do this moment. Going to tinker a bit shortly, see if more can be done. Funny you noticed the dragging feet. I didn't notice. I was simply giving you a hard time. Jim, I been working on a shed for a month or more. Dragging feet? My middle name Lately
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 15:44:02 GMT -5
Can I just leave a stub sticking up on the shaft to lay the abrasive plate on ? Will friction keep it in place ? Or do I need a threaded shaft to secure the abrasive plate down ? I noticed the glass blower's lap did not have a nut to hold plate down. Just a little stub. It relied on friction. It is a 12 inch lap. Estimated speed on this lap about 500 to 700 RPM at abrasive plate. I simply used a new 3 inch heavy duty cast iron sheave that will have the backing plate bolted to. I will countersink the bolt holes so the top of the backer is flush.
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jamesp
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Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 15:45:01 GMT -5
Kilns running, fire pit bowls arriving, tumblers loaded to the hilt, dog breeding going on, just too much to do this moment. Going to tinker a bit shortly, see if more can be done. Funny you noticed the dragging feet. I didn't notice. I was simply giving you a hard time. Jim, I been working on a shed for a month or more. Dragging feet? My middle name Lately If we are in a hurry it is only because we want to be.
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jamesp
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Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 15:49:19 GMT -5
looking good James! I always enjoy seeing homemade equipment. Addicted to home made tools/equipment. Especially specialty equipment NDK. People can make great money designing and building tools that do specialty jobs. Or just good tooling. I would have renovated an old lap but none have popped up on Ebay. This one will fit me. If it doesn't it will received a massage from the torch till it fits . Wish me well please.
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Post by Drummond Island Rocks on Mar 6, 2018 15:53:17 GMT -5
Good question about threading the rod. On most flat laps that is not an option because the backer plate is not mounted to the shaft so that nut is what pulls it all together. Not sure if anyone will have a definite answer. A shaft collar could be slid on top and tightened just for safety if needed.
You had mentioned earlier going down to 1/6 Hp. I run my mine with 1/3 HP at 1725 and no reduction between the motor and lap. I can still bring the machine to stop (and do) when pressing down too hard.
Chuck
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jamesp
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Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 16:11:19 GMT -5
Good question about threading the rod. On most flat laps that is not an option because the backer plate is not mounted to the shaft so that nut is what pulls it all together. Not sure if anyone will have a definite answer. A shaft collar could be slid on top and tightened just for safety if needed. You had mentioned earlier going down to 1/6 Hp. I run my mine with 1/3 HP at 1725 and no reduction between the motor and lap. I can still bring the machine to stop (and do) when pressing down too hard. Chuck Yes, the shaft collar may do the trick. Thanks for answering, this issue was holding up progress. And if all else fails it will not take long to replace the shaft with a threaded one. OK, that answers that. I will do the 1/4 HP. The other issue holding things up. Great to have free consultation. Are you billing ? And what is your rate ? Please not as high as the lawyer's rates.... So a bolted down backer is not typical ? hmmm. Wonder why. It seems unnecessary to remove it except when replacing a bearing or such. Thanks for the quick response. It won't be long.
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Post by Drummond Island Rocks on Mar 6, 2018 16:21:06 GMT -5
Good question about threading the rod. On most flat laps that is not an option because the backer plate is not mounted to the shaft so that nut is what pulls it all together. Not sure if anyone will have a definite answer. A shaft collar could be slid on top and tightened just for safety if needed. You had mentioned earlier going down to 1/6 Hp. I run my mine with 1/3 HP at 1725 and no reduction between the motor and lap. I can still bring the machine to stop (and do) when pressing down too hard. Chuck Yes, the shaft collar may do the trick. Thanks for answering, this issue was holding up progress. And if all else fails it will not take long to replace the shaft with a threaded one. OK, that answers that. I will do the 1/4 HP. The other issue holding things up. Great to have free consultation. Are you billing ? And what is your rate ? Please not as high as the lawyer's rates.... So a bolted down backer is not typical ? hmmm. Wonder why. It seems unnecessary to remove it except when replacing a bearing or such. Thanks for the quick response. It won't be long. My first answer is that mine would be a bear to clean the mud out of if I could not easily remove that plate. The other answer would be that it leaves them open to installing many different items on the shaft. I mentioned earlier that a bunch these types of machines were used as mini slab saws and I have also bought them with 1" thick SC wheels mounted with no back plate at all. There are also true high tolerance diamond laps available nearly 1/2" thick that are used without a backer plate. None of that applies to you so carry on. A simple slip collar will keep OSHA happy. Chuck
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jamesp
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Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 6, 2018 19:40:59 GMT -5
Yes, the shaft collar may do the trick. Thanks for answering, this issue was holding up progress. And if all else fails it will not take long to replace the shaft with a threaded one. OK, that answers that. I will do the 1/4 HP. The other issue holding things up. Great to have free consultation. Are you billing ? And what is your rate ? Please not as high as the lawyer's rates.... So a bolted down backer is not typical ? hmmm. Wonder why. It seems unnecessary to remove it except when replacing a bearing or such. Thanks for the quick response. It won't be long. My first answer is that mine would be a bear to clean the mud out of if I could not easily remove that plate. The other answer would be that it leaves them open to installing many different items on the shaft. I mentioned earlier that a bunch these types of machines were used as mini slab saws and I have also bought them with 1" thick SC wheels mounted with no back plate at all. There are also true high tolerance diamond laps available nearly 1/2" thick that are used without a backer plate. None of that applies to you so carry on. A simple slip collar will keep OSHA happy. Chuck Forgot about cleaning the mud in the bowl. Big issue. Impossible access issue. A beware - I ordered an abrasive wheel out of China and it arrived today. It DOES NOT have a 1/2"/12.7mm hole. It has a 13mm hole. And that is not good. Mind you it only cost $12 but that much oversize could make it run off balance. No matter, it is 60 grit and it looks and feels more like 10 grit. Nastiest diamond grinding wheel I have ever seen, way too coarse. Do you use a diamond wheel or do you use powdered abrasives ?
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Post by Drummond Island Rocks on Mar 6, 2018 21:52:04 GMT -5
My first answer is that mine would be a bear to clean the mud out of if I could not easily remove that plate. The other answer would be that it leaves them open to installing many different items on the shaft. I mentioned earlier that a bunch these types of machines were used as mini slab saws and I have also bought them with 1" thick SC wheels mounted with no back plate at all. There are also true high tolerance diamond laps available nearly 1/2" thick that are used without a backer plate. None of that applies to you so carry on. A simple slip collar will keep OSHA happy. Chuck Forgot about cleaning the mud in the bowl. Big issue. Impossible access issue. A beware - I ordered an abrasive wheel out of China and it arrived today. It DOES NOT have a 1/2"/12.7mm hole. It has a 13mm hole. And that is not good. Mind you it only cost $12 but that much oversize could make it run off balance. No matter, it is 60 grit and it looks and feels more like 10 grit. Nastiest diamond grinding wheel I have ever seen, way too coarse. Do you use a diamond wheel or do you use powdered abrasives ? When I first started cabbing all I had was the flat lap so I was using diamond plates from 100,320,600,1200 and then polishing on an 8" felt pad. Nowadays I only use it with a 100 grit disc for flattening fordite and petoskey stones before cabbing. I have had pretty good luck with these inexpensive plates for the non cabbing work I do now. www.ebay.com/itm/8-inch-Quality-Electroplated-Diamond-coated-Flat-Lap-Disk-wheel/291177639228?ssPageName=STRK%3AMEBIDX%3AIT&var=590325337411&_trksid=p2060353.m1438.l2649Chuck
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 7, 2018 4:48:41 GMT -5
Forgot about cleaning the mud in the bowl. Big issue. Impossible access issue. A beware - I ordered an abrasive wheel out of China and it arrived today. It DOES NOT have a 1/2"/12.7mm hole. It has a 13mm hole. And that is not good. Mind you it only cost $12 but that much oversize could make it run off balance. No matter, it is 60 grit and it looks and feels more like 10 grit. Nastiest diamond grinding wheel I have ever seen, way too coarse. Do you use a diamond wheel or do you use powdered abrasives ? When I first started cabbing all I had was the flat lap so I was using diamond plates from 100,320,600,1200 and then polishing on an 8" felt pad. Nowadays I only use it with a 100 grit disc for flattening fordite and petoskey stones before cabbing. I have had pretty good luck with these inexpensive plates for the non cabbing work I do now. www.ebay.com/itm/8-inch-Quality-Electroplated-Diamond-coated-Flat-Lap-Disk-wheel/291177639228?ssPageName=STRK%3AMEBIDX%3AIT&var=590325337411&_trksid=p2060353.m1438.l2649Chuck Chuck, this lapper will have yet another much wetter task. There will be a garden hose fitting welded on the side of the bowl in an optimum location determined once it is running. It has to do with making colored glass shavings and capturing them in a bucket below the lapper with a water overflow. The shavings will be remelted in a kiln for making colored glass. I was given a large amount of fixed COE glass scrap. Colored glass with a fixed COE costs 25 to 200 dollars per pound and much more so it behooves me to make my own. I can also grind 2 or 3 different colors and capture the shavings in a mix and make whatever color I desire. Sounds like your lapper was the birth of your cab making interest. I remember you buying a Genie ?? I believe. Maybe yet another cab machine ? Anyway I know you are a serious cabber now. You mentioned a polishing felt pad. What is this 8 inch felt pad ? For these 8 inch lappers ? Can they be charged with 1000 and 5000 if you have separate pads ? I melt a lot of glass that has a dull flame polish, 1000 and 5000 and maybe 50,000 pads would put me on high polish on failed melt cabs.
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Post by Drummond Island Rocks on Mar 7, 2018 8:08:15 GMT -5
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Post by Drummond Island Rocks on Mar 7, 2018 11:33:28 GMT -5
Here is a photo of my thicker pink polish pads. This one is brand new from an estate sale. I have not never been able to find the exact ones online. Chuck
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,392
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Post by jamesp on Mar 9, 2018 10:19:28 GMT -5
Here is a photo of my thicker pink polish pads. This one is brand new from an estate sale. I have not never been able to find the exact ones online. Chuck So will a hard plate polish ? Like 2000 or 3000 grit ? This range tends to put a fair shine down. I am looking to polish the flat backs and figured the hard plates may do that well. Guessing the pads work best for the curved dome side ? Kingsley sell 8 inch pads ?
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Post by woodman on Mar 9, 2018 10:49:14 GMT -5
Here is a photo of my thicker pink polish pads. This one is brand new from an estate sale. I have not never been able to find the exact ones online. Chuck So will a hard plate polish ? Like 2000 or 3000 grit ? This range tends to put a fair shine down. I am looking to polish the flat backs and figured the hard plates may do that well. Guessing the pads work best for the curved dome side ? Kingsley sell 8 inch pads ? The pads saturated with cerium oxide will polish real good.
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