Would others be interested in a CNC machine for $2k-$4k? laser/plasma cutter options

Discussion in 'Hangar Flying' started by CobraCar11, Mar 2, 2016.

1. Mar 4, 2016

bmcj

Well-Known MemberHBA Supporter

Joined:
Apr 10, 2007
Messages:
12,974
4,919
Location:
Fresno, California
Re: Would others be interested in a CNC machine for $2k-$4k? laser/plasma cutter opti

You had me at "new toy". :gig:

spaschke and Midniteoyl like this.
2. Mar 7, 2016

WK95

Well-Known Member

Joined:
Sep 29, 2014
Messages:
387
68
Location:
Queens, NY
Re: Would others be interested in a CNC machine for $2k-$4k? laser/plasma cutter opti

speaking strictly for myself, I don't need the sort of tolerances for composite work compared to sheet metal or wood work. Mostly, I'd like a 5-axis CNC to make molds and forms. In most cases, it seems 1/100 of an inch might be fine enough. Lots of flox, micro, and sandpaper where needed might help out with making things fit.

3. Mar 7, 2016

FritzW

Well-Known Member

Joined:
Jan 31, 2011
Messages:
3,718
3,339
Location:
Las Cruces, NM
Re: Would others be interested in a CNC machine for $2k-$4k? laser/plasma cutter opti

...on the "belt drive vs. lead screw" subject: my machine uses a very short cog belt to a rack and pinion gear for X and Y and a jack screw on the Z. Any backlash error in the machine is far below how much the machine (any machine) will change from a cold morning to a hot afternoon.

People are okay with using a Harbor Freight tape measure to draw a line with a .07" pencil that they cut with a wobbly band saw but they freak out if they think a CNC machine has .001 backlash :gig:

Put it in perspective: Just about any reasonable machine you build will hold it's accuracy to within a few thousandths after an hour long cut job ...then, when it's all done, plow your $60 bit through the middle of$200 worth of finished material because you screwed up the G Code (...been there :cry: )

I just cut the seat pan for a Waiex project tonight (modified to single stick). Any machine error is "in the noise" compared to the errors that would add up if I'd used a Harbor Freight tape measure, Sharpie marker, tin snips and a file. And it was a shiiiiiiiiiit load easier and faster.

I also made a butt load of phenolic canopy latch plates for the gang on the Sonex builders group. Any error wasn't measurable with my dial caliper.

thunderstangfan likes this.