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[lithicbeads]

I use grit trays. Loose grit in a pile with a water drip that is variable.I use very little water. The end of the stainless steel tray has a piece of hose cut on a bias on the down hill end to deliver the grit accurately.I have made these out of quart milk containers cut long ways duct taped to a dowel.

[robirdman]

I finally came back to this after I successfully soldered one tube to a bolt, and used a smaller tube directing the spray. I added SiC and got a spray going in balance with the uptake so the basin doesn't fill.  I think the instructions were lost in the 2010 fire I had.  I powered on, and wasn't sure how much power to use.  When I moved the dial farther to the right, everything went off, as the socket circuit breaker kicked in.  I reset and tried again not going beyond the blue level, bu
t I don't know how much intensity to use with the other meter, which goes up to 30.  I used the foot switch and held a stone under the tube but didn't seem to be noticing much if any vibration with the pump and power noise.  After I turned off and even unplugged, I was still hearing some noise in the power unit.

[lithicbeads]

If you can run it for testing with the pump off it would be less distracting.You can use a small plastic container of very wet grit and put the end of the bit in that. It is essentially the same as when you drill big flats  with my drill so there would be enough grit but no distracting noise.

[robirdman]

That's an idead. What kind of settings does your unit have and that you set?

[lithicbeads]

If the bit isnt in the water grit mix it can sometimes vibrate itself off the horn. Mine is largely automatic but gouing too high will often not work. If the solder joint is bad that can stop the bit from vibrating even if it does not come off the horn. Do you solder your bits on or use acoustical washers?