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Post by aDave on Jul 4, 2023 17:25:01 GMT -5
I know nothing about this stuff, but I found this, and it might be helpful, as it's a pulley speed calculator. If you're able to figure out pulley sizes, just plug them in to get your speeds, or so it seems. If you don't like this one, just Google for another. It seems like there are many out there. I imagine someone will come along to let you what speed your wheels should be turning for the different material you might be working. www.blocklayer.com/pulley-belteng
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Post by perkins17 on Jul 4, 2023 20:55:46 GMT -5
That's a good machine. I have one that I've used as my main arbor for quite some time. The sic wheels are still every usable. Just grab a diamond t-bar dresser from Kingsley north, and they'll be like new. An 80 grit sintered diamond and an 8x3 expandable drum would be the ideal setup for this machine. 250 with hoods isn't too bad, I payed 50 for mine untested without hoods a few years back. Good for you. Don't snip the belt, it doesn't need replaced until it breaks. The motor should be fine until it starts smelling pretty strongly of varnish. Check to see if it had oil ports, and shoot a couple 3-4 drops of 30 weight of 3in1 oil in each. C-clamps onto your bench should be great for minimizing vibration. You really shouldn't have to adjust the belt once you've got it to a comfortable speed.
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Post by catmandewe on Jul 5, 2023 0:54:41 GMT -5
Thats a good deal on a good machine!
Get a wheel dresser and use those wheels until you find a good deal on diamond wheels.
One thing to note with SIC wheels is when you are finished you need to shut off your water supply and let the wheels spin under power for 3-5 minutes to expel all the water that has permeated into the wheel. If you shut it off while it is wet, then the water will settle to the bottom of the wheel and the next time you start up the machine the water on one side of the wheel can throw it out of balance, sometimes enough to cause the wheel to grenade on you.
Play with the machine and get used to it before you decide to change a bunch of stuff around, you will like it, its a good machine.
Tony
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Post by perkins17 on Jul 5, 2023 10:30:41 GMT -5
perkins17 Hey I'm glad you replied, I saw your post about your new machine and started wondering if maybe you'll get rid of your poly so I can have two I actually spent a few hours today reading almost all of your threads. I'm taking many of the same steps you took a year or two ago so it's been a good read. I know you said you got your price down from 50 to 35 and eventually 25! And all of your equipment and slabs you've gotten for insane prices like $5 or free. You're very lucky or very talented at negotiating. Yea having an expandable drum with belts on one side would really let me go all the way with this machine. There's no balance worries if you have a skinny on one side and expando on the other? I'm in a local club too so I plan to do the same thing as you and call upon the old-timers to help me check it over. Right now without an expando my plan is to just pre-shape tumbler material and preforms, then polish at the club's lab. I also want to get into bead making so I needed my own arbor that I can spend time building a jig around. How often do you have to dress a SiC wheel? The pet wood slab that I held against it for a 10 second test grind already noticeably deformed the surface of the already deformed wheel. I feel like I'd have to dress it after each stone. Thanks for the clamp tip, I think that will help. I'm still thinking about replacing the belt though. I watched a video describing how the link belts reduce vibration. When a belt is tensioned and idle for long periods, like these almost certainly have been, they eventually hold an oval shape where the two pulleys were stretching it. When you use it that bend in the belt causes it to wiggle and cause vibration. The links are made out of a hard inflexible material that solves that problem. From what I'm reading speed can make a difference with certain stones so I'm excited to have the ability to change speeds and want it to be convenient for me to change it, like putting a new belt on the drum. I think I can tuck the old belt out of the way without cutting it while I try the link belt. Never! This is a machine I want to be buried with some day. You're right, I did end up getting it for 25 after meeting the dude in person. I'm pretty good at negotiating, and finding the right people to buy things from has definitely helped. I'm sure it won't take much work to get it into usable condition, especially with the help of some old timers. You may be right about the link belt it sounds like. Mine had little to no tension on it, so I was able to get it to do its thing pretty easily. Best of luck getting it there, -Nicholas Missed something, I dressed my wheel about every 10 minutes of work, give or take. Just watch the wheel and try to move the material around on the wheel to try and keep it as equal as possible.
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Post by Mel on Jul 21, 2023 11:34:39 GMT -5
What motor are you guys using on your setups perkins17 & @hefty? I got one of these with a bunch of other stuff I bought but its basically just the body/wheels/pan, no water system, motor or guards. My vague knowledge of them led me to believe a lot of people either use them for polishing only or heavy grinding.
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Post by perkins17 on Jul 21, 2023 14:07:05 GMT -5
What motor are you guys using on your setups perkins17 & @hefty? I got one of these with a bunch of other stuff I bought but its basically just the body/wheels/pan, no water system, motor or guards. My vague knowledge of them led me to believe a lot of people either use them for polishing only or heavy grinding. I've got a 3rd of a horse on there right now. They're pretty robust, I used mine for all my cabbing prior to my new highland park. Expanding drum on one side with belts, sintered 80 on the other.
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gemfeller
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Post by gemfeller on Jul 21, 2023 15:24:32 GMT -5
Those are the arbors I started cutting with. But for a divorce that limited all my earthly possessions to what would fit into a VW Bug, I'd probably still have them. Re: vibrations -- they're likely caused by out-of-balance wheels. When you get your carbide wheels dressed or replaced they should be reduced or eliminated. And I second and third Catmandewe's caution about letting carbide wheels spin dry after a cutting session. Waterloggd SIC wheels are dangerous!
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Post by Mel on Jul 31, 2023 14:38:01 GMT -5
Perfect. It's on my project list but I have so much on there right now it feels like it'll be a month of Sundays before I get anything done.
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