Questions on using a moving gantry style mini-mill...

[JAZZCNC]

I'd come of the quill to save grief. Chances are you'll only use small tooling anyway so no great stress.

[Davek0974]

Why do you want 24k on the mill surely you would be better having some lower end torque and going for maybe 6-10k, 6k bottom end seems to high for a mill, I may be completely wrong as a complete noob but I would have thought you are losing more than your gaining with a 24k with bottom end around 6k.

It's all about flexibility - the mill itself has 2Hp and 50-3000rpm range - no good for small cutters or engraving, great for hogging the crap out of steel etc with large tooling. The spindle has the speed for small cutters and engraving but no good for big tooling or steel work. The Base machine is simply a very heavy X/Y table - 300mm in Y and 1000mm in X - way bigger than my mini-mill.

I'd come of the quill to save grief. Chances are you'll only use small tooling anyway so no great stress.

That's my view too, I have 125mm of Z axis movement and losing 30-40mm for the clamp won't hurt as there is also a manual 300mm of table up/down - no engraving spindle is going to be diving more than 80mm into the work so travel seems adequate even allowing for clearance plane above clamps etc.

This is also the easy option to test out - only wastes a block of aluminium if it fails, my point of weakness would likely be vibration causing chatter marks, but time will tell here.

[lucan07]

It's all about flexibility - the mill itself has 2Hp and 50-3000rpm range - no good for small cutters or engraving, great for hogging the crap out of steel etc with large tooling. The spindle has the speed for small cutters and engraving but no good for big tooling or steel work. The Base machine is simply a very heavy X/Y table - 300mm in Y and 1000mm in X - way bigger than my mini-mill.

If its about flexibility then why not keep the grunt and mount a spindle to one side might have to extend arm on right past the 24k spindle but looking at it should be possible, the you would probably still have 800x300 travel on the 24k and the ability to hog the crap out of steel when needed. I would be a fantastic base for a router for engraving and using small endmills but severely limited in the type of work it was designed to do

[Davek0974]

That is exactly my plan, should have explained better ;)

The 24k spindle is not going be full-time mounted, its an option and will be pulled off when not needed.

Due to the way the head swivels on the BP I can probably maintain near full X travel if needed just by moving the ram to the left when the spindle is in use, its a very flexible machine - that's why i like it so much.

[JAZZCNC]

If its about flexibility then why not keep the grunt and mount a spindle to one side

Maybe you need to read again because that's exactly what Dave's talking about doing.!!

[lucan07]

Obviously I missed something, somewhere in the posts.

[Davek0974]

The clamp block for holding the spindle to the mill, better made out of one big lump or two plates maybe 12mm thick spaced apart 10mm or so?

[Lee Roberts]

The clamp block for holding the spindle to the mill, better made out of one big lump or two plates maybe 12mm thick spaced apart 10mm or so?

My choice would be a single lump or to space them out more if it's for a typical water cooled spindle, 12's a bit thin in my book.

.Me