Scott Memmer
02-07-2021, 11:30 AM
I have just a bit of a weird one.
I recently got a fantastic deal on an ancient Lapmaster lapping machine. This thing is from the fifties, runs perfectly, and is built like a Sherman tank. Just amazing.
Initially I'm going to be using it only for polishing. To accomplish this, I'm mounting a 12-inch felt pad on top of the old felt pad. The original pad looks to be as ancient as the machine itself, decades old, hard as a rock, and perhaps has some trace oils in it.
https://i.imgur.com/nSGFV01.jpg
I am mounting on the original pad a thin piece of plywood. Because this is all kind of Rube Goldberg, I want to use an adhesive that doesn't set or cling right away (which takes out contact cement or super glue) but is instead workable and with a slower setting time. This will allow me the time to turn on the machine (which rotates at only 70 rpm) and align the wooden disc as close to centered as I can get it.
https://i.imgur.com/JrKTK9f.jpg
I have a bunch of Titebond 3, and I'm thinking either that or Epoxy are my two best choices. What do you think? Other suggestions.
While we're at it, once I have the wood glued and set in place, I will then be mounting a 12-inch mounting pad on top of it (pictured below). Initially I thought I'd just glue it in place, but I'm now thinking of Velcro-ing it instead. This way I can remove and replace different pads with increasingly fine grits. Again, for the time being this machine will only be used as a polishing machine, not for grinding or flattening.
https://i.imgur.com/kF0i1OS.jpg
OPTION TWO: Another thought I had was to instead glue the Velcro directly onto the original ancient felt pad, then remove and replace different new felt pads via Velcro. My concern here is that the Velcro will not hold because the older pad is saturated with oils.
Yeah, a little weird. Appreciate your suggestions.
sm
I recently got a fantastic deal on an ancient Lapmaster lapping machine. This thing is from the fifties, runs perfectly, and is built like a Sherman tank. Just amazing.
Initially I'm going to be using it only for polishing. To accomplish this, I'm mounting a 12-inch felt pad on top of the old felt pad. The original pad looks to be as ancient as the machine itself, decades old, hard as a rock, and perhaps has some trace oils in it.
https://i.imgur.com/nSGFV01.jpg
I am mounting on the original pad a thin piece of plywood. Because this is all kind of Rube Goldberg, I want to use an adhesive that doesn't set or cling right away (which takes out contact cement or super glue) but is instead workable and with a slower setting time. This will allow me the time to turn on the machine (which rotates at only 70 rpm) and align the wooden disc as close to centered as I can get it.
https://i.imgur.com/JrKTK9f.jpg
I have a bunch of Titebond 3, and I'm thinking either that or Epoxy are my two best choices. What do you think? Other suggestions.
While we're at it, once I have the wood glued and set in place, I will then be mounting a 12-inch mounting pad on top of it (pictured below). Initially I thought I'd just glue it in place, but I'm now thinking of Velcro-ing it instead. This way I can remove and replace different pads with increasingly fine grits. Again, for the time being this machine will only be used as a polishing machine, not for grinding or flattening.
https://i.imgur.com/kF0i1OS.jpg
OPTION TWO: Another thought I had was to instead glue the Velcro directly onto the original ancient felt pad, then remove and replace different new felt pads via Velcro. My concern here is that the Velcro will not hold because the older pad is saturated with oils.
Yeah, a little weird. Appreciate your suggestions.
sm