First timer - milling parts from mdf - suggestions?

[stocky6409]

Hi all - I'm in the process of getting my small SABLE mill working and as a simple first project i thought i'd try and cut some parts from 6mm MDF (i'm making some equipment to assist me in assemblying SMD components)

I have drawn the item in a CAD package and managed to get it into LazyCAM so I think i'm almost there on that front - few things to work out yet but happy with progress.

My main query is what cutter to use? The mill only has a small motor with a chuck that supports up to approx 1/4" shank so I guess I can use a small straight router bit and just run multiple passes with a shallow depth of cut?

I guess "dremel" have small router bits as well although nothing stocked locally that i can find - might have to wait till i get to the "big smoke" for a look.

Anyone got any suggestions/hints for young (!) players??

Regards

Stocky

[posix]

what you need to do is use the chip load calculator http://www.whitney-tool.com/html/cal...SpeedFeed.html and then for your first cuts start at 20-30% of what it says. yes you will possibly leave some burn marks on the material, but it's a good start to get some experience and feel for how it all works. after you've made a few test parts then start cranking up the speed. good luck!

[ger21]

Don't worry about the chip load. Be sure to use carbide, either a simple 1 or 2 flute carbide tipped straight bit or solid carbide spiral bit. With a spiral bit, a downcut will give you a cleaner edge. Even an end mill for metal will work in a pinch, and they're cheaper.
I don't think the Sable is very fast, is it? Cut as fast as it can go, and start with a very shallow depth of cut (.75-1mm), at the lowest rpm you can (10,000 or so). Slowly increase depth of cut if the machine can handle it.

If it's burning, you need to slow the spindle or increase feedrate.

[wildwestpat]

Hi Stocky

Try and ensure that the cutting bit keeps moving as MDF has a fluffy surface and friction will start a burn mark if the cutter X&Y are held still for too long. Suggest you use some method of dust extraction as MDF dust is not good for the lungs and invest in a face mask of the appropriate standard for MDF.

Good luck

Regards

Pat