Originally Posted by
Derek Cohen
Steve, your posts illuminate a number of the issues well. I agree with all of the points you made but one, and that relates to the use of a CNC. The point I will made links with George's term, "hand machined", which is applicable here.
Derek,
Thanks for the comments. It is kind of funny to be getting so much pushback on this, to the point of obviously offending some people (not you, but others), considering that 95% of my own work is done with hand tools and I haven't touched a CNC machine in over 10 years.
Admittedly, my example of CNC machining is a bit extreme and I don't blame you for disagreeing. However, I don't agree with your reasoning. Let me work through a couple points.
In my mind, the central issue is that the piece being made is controlled by the hand, and there must be a
direct link to the hand. The hand hold the work piece and pushes it through a tablesaw blade. The hand hold the saw/handplane/chisel that cuts/saws/carves the work piece. The hand hold a drill/router or the hand pushes the workpiece through a router table or against a spindle sander. In all these, the shaping of the work piece has a direct connection to the hand.
I don't know why there has to be a direct link to the hand; it seems an arbitrary requirement. But let's go with it for now. Every mill or metal lathe I've ever used has power feed. I'd guess it's been standard on machines since at least the 50s, if not before. To make a cut of more than a few inches on a lathe, one would nearly always use the power feed, since it produces a better finish. So, would you say that if I crank through the cut by turning the handle manually (an operation that takes less skill than feeding a piece of wood to a table saw), I'm working by hand, but if I throw the lever that activates the power feed, I'm not?
Or consider threading on the lathe. On a "manual" lathe, once I'm set up, I throw a lever and the machine feeds through the cut, automatically bottoming out and stopping when it hits a pre-set stop. On a snazzy toolroom lathe like the Hardinge, I pull another lever and the cutter retracts without me having to touch my depth of cut setting. I throw another lever to feed back to the starting point, advance the cutter a few thousandths, and repeat. At no point am I actually controlling the cut with my hands. And the only thing that's different on a CNC lathe is that the retracting/advancing steps are done automatically and much faster.
The point is that almost none of the skill in using a metal lathe (or mill) has to do with the cranking the handles through the cut, the "direct link" that you describe. A machinist needs to be able to sharpen a tool (that's half the ballgame, at least), know speeds and feeds, deal with deflection, vibration, heat, and a host of other issues, secure the part in the machine, indicate it in, etc. etc. Most of these things are done by hand and eye, regardless of whether it's a manual machine or CNC. And they take a great deal of training and skill. An unskilled person who couldn't make a threaded shaft on a manual lathe, couldn't make one on a CNC either.
So, if we're going to disqualify CNC work from the "hand made" category (which is fine with me), we need to disqualify manual machining as well, because as I hope I've demonstrated, they are not that different and there is an enormous amount of overlap between the two categories. I think a lot of people here think that "CNC" means you walk up to computer, type in a few instructions, and out comes a part without ever getting your hands dirty. And that is simply not the case.
Personally, I think the whole discussion of whether something is "hand made" is about as useful as debating where the "real America" is. I'd prefer "custom made" or "made in small batches." Currently, I make planes by using a few antiquated machines for only the roughest operations, and doing most of the work (and all finished surfaces) by hand. If I bought a mill, would my work be less hand made? Perhaps. Would it be less custom made? Definitely not.
Last edited by Steve Voigt; 09-17-2016 at 11:50 PM.
"For me, chairs and chairmaking are a means to an end. My real goal is to spend my days in a quiet, dustless shop doing hand work on an object that is beautiful, useful and fun to make." --Peter Galbert