Advice on type of CNC Machine to buy/build

[GaryWilliams]

Hi silyavski and JAZZCNC,

Thanks for the replies. I forgot the grinding/coolant issue. Just shows how long it has been since I was last in a machine shop! I will forget the valves and look to outsource that job.

All the other jobs are milling/routing jobs. They will be 2D/3D shapes in MDF, plastic, PVC, Nylon, etc up to A4 size. All relatively soft materials. Do you think this Chinese 3040 machine will be adequate for these jobs - eBay item number:400882540881?

If I can find a machine that can also mill the con rod, I can then support my son with his Kart engine modifications, the con rod being the largest and most complex item. The other bits will be simple brackets, flanges, etc.

Can you suggest any particular make/model of machine that could handle this?

Cheers

Gary

[JAZZCNC]

The 3040T version with watercolled spindle will work for the softer stuff but the machine it's self will struggle with aluminium due to lack of strength and low quality linear components.
The electronics on these machines are mostly cheap nasty items and will at some point cause you trouble. Often sooner rather than later.! Avoid any version that uses DC spindle.

These machines are great for cutting your teeth on and learning CNC but don't expect to much from them.!!. . . They are cheap low quality and it shows in what comes out the sharp end.

[GaryWilliams]

Hi JazzCNC,

Thanks for this. What is the problem with DC motors for the spindle? I'm going to buy one of the 3040's to learn on, then look to build a serious one for milling con rods, etc. What type/size/power cnc do you use? Can you recommend a kit/spec that will handle aluminum blocks?

Cheers

Gary

[JAZZCNC]

Hi JazzCNC,

Thanks for this. What is the problem with DC motors for the spindle? I'm going to buy one of the 3040's to learn on, then look to build a serious one for milling con rods, etc. What type/size/power cnc do you use? Can you recommend a kit/spec that will handle aluminum blocks?

Cheers

Gary

The use Carbon brushes and burnout in no time. Complete rubbish best avoided.!!

For milling aluminium you'll want a spindle that can run between 7000rpm and approx 18000 dependent on tool size. Water cooled 2.2Kw works fine for cutting aluminium and suits routing softer materials as well with it's 6000 to 24000rpm range.

[Boyan Silyavski]

ebay item 400882540881

That is a toy, not a machine. Its a recipe for frustration. Plus buying it from people who sell tattoos... I wish i could forbid somehow that "machines" from selling

[GaryWilliams]

Hi silyavski and JazzCNC,

I am definately looking at better quality machines now and increased my budget considerably.

Thanks

Gary