[savall21]

I have been communicating with an ebay seller that operates the mekanika.info site. I am a newbie looking to get my first CNC machine. The design looks solid to my untrained eye but I would like a second opinion or to talk with someone who has done business with them.

Any help is appreciated.

[jsheerin]

Concerns I would have would be:
-Does it have thrust bearings at the motor ends of the lead screws? I can't tell from the pics. Stepper motors aren't designed to take thrust loads, so without thrust bearings, you will be abusing your motors.
-How much backlash do the brass nuts have? The typical solution here for a machine of this size are Dumpstercnc antibacklash nuts. I'd imagine the brass nuts would be stronger, but you probably don't need that strength on a machine this size. I push around a 100+ pound gantry with the dumpster nuts and 1/2" screws.
-How fast will it go with the motors you want to use? It looks like the screws are multi-start which would be good, but I really can't tell for sure from the low-res pics.
-Is a rotary tool like that big enough for what you want to cut?

[FandZ]

Does he have a link on ebay? There's just too much pixalation on his website to get a good look. If the price is right, you may be able to upgrade any inferior parts.

[savall21]

Wow! Thanks for the info. Unfortunately, my CNC IQ is limited. He does have an ebay listing.

http://cgi.ebay.com/ws/eBayISAPI.dll...:X:RTQ:US:1123

He also sent two images. The price is definitely right. He wants $600 assembled and ready to install stepper motors. A small router should work. I plan to use this primarily to cut airplane parts from Dow 1/4" Bluecore foam.

Again, thank you for the input.

[agguilar]

were did you get the pictures you post ???