ERLover wroteBeave, JPG as always right on, but did not know what you have, my ER dedicated DP with a speed changer is so good on the low speed end, 400 ish RPM, a Mark is 700. But you can add a DC motor to it, 0-2000 rpm, still thinking about that 4-500$ for one.
I didn't say I didn't want it... lol, just can't justify $200 and the space. I am still in a 3rd stall garage, and got a ton sitting there already. Space is a premium and unfortunately I don't have enough.
If I could, I would make the 500 into a mini and use 10ER as a drill press.