DIY Epoxy composite gantry frame milling machine

[John McNamara]

Hi
Most laser cutters provide the mild steel and cutting at a quoted price. Many will also have Stainless and Aluminium Etc.
It is not possible to work out the cost on the basis of so much a millimeter.

The main thing is to provide properly drawn 2D files, usually DXF files. The part outline must not have any breaks or overlapping lines, All holes must also be closed. (And nothing else in the file) Each part should have its own file. Don't try to nest the parts yourself in a big file.

Laser cutters are pretty busy businesses, If you provide good files you will be charged as a professional. If you cant provide files some will draw the parts for you, be prepared for a shock when they quote to do this.

Just email your requirements and the file set in a Zip file and most will reply with a quote in a day or two. (A separate zip file should be used for each material type and thickness. this avoids confusion) It is OK to have a short discussion when starting with them asking if they have any special requirements.

I really like the rail alignment cams - did you make these or buy them? They are going to be great for both alignment and increasing mounting strength of the rails.
[
I had them laser cut from 4mm steel they cost about 50c each the laser cutter provided the material

The Z axis travel seems a bit short compared to your other travels. What sort of spindle / tool holder are you going to use?

I drew in an Asian high speed spindle fine for Aluminium Brass and plastics and fairly low cost. I also plan to build a 30 or 40 taper spindle, Possibly using the high speed 2000 rpm spindle with a 4 to one reduction belt drive. I also have a large Manual V Mill, It is easy to make the Z axis taller I decided not to as this machine will be used for smaller parts. Shorter = less deflection

What was the cost of the laser cut steel? Do they cost it per cm cutting length or similar? I'm interesting in getting a milling head and gantry beam laser cut. I'll probably use square hollow section for the base however.
Laser cutting cost of the machine parts was about $500 including material plus the molds that cost more I am sharing the cost of the molds. 160+ part files is a lot quite a few of the parts were in multiples. looking at it that way the cost per part is modest. FWIW the cost per kg of parts was AUD $3.85 All up inc GST/VAT. I would not try to use that figure it will depend on the mix of parts, OK I guess as a ballpark.