I mean, everything looks great about them. Darn near zero backlash, etc., etc. I'm not worried about speed.

But if I throw a little too much torque at one while cutting some steel, am I going to have a nice little package full of former gear teeth bolted to my table? Are they likely to self-destruct?

And if I go with one, what is a good ratio? 10:1? 20:1? 50:1? Looks like I'll be bolting on a 570 oz stepper from Automation Technolgies, at least to start...