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Author Topic: Educational Sources???  (Read 8920 times)

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Offline Davek0974

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Re: Educational Sources???
« Reply #30 on: February 15, 2016, 02:52:03 PM »
Great stuff, found out how to do a ramped spiral cut, works well in simulation anyway.

Also found the "sharpen corners" features, will need that for a job in mind, again it looks ideal for my needs.

Nice, and I never even knew it could do it :)

Offline rcaffin

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Re: Educational Sources???
« Reply #31 on: February 15, 2016, 03:32:41 PM »
The invoice will follow ...
Cheers
Roger

Offline Davek0974

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Re: Educational Sources???
« Reply #32 on: February 15, 2016, 03:45:00 PM »
This place is an absolute gold mine of information and helpful people, hard to find these days.


Thanks to all for the help so far.
Re: Educational Sources???
« Reply #33 on: February 16, 2016, 02:26:41 AM »
hi davek0974,
sounds like youre sorted with software for the moment. I tried Fusion and it wasn't bad, the CAM is pretty seemless with the CAD. In the end I found the lack of 'determinism'
let it down. No doubt the programers of Fusion think their software is intuitive it can also be hard to control both CAD and CAM. It is free tho....
I went back to Mastercam which is not and can be cussed as hell at times but dependable and configurable.
I have a smaller spindle, 750W and use it a lot for PCB's and some aluminium. It is NOT up to steel. All the high speed spindles have poor torque at low speeds and if the spindle
stalls you have yet another broken tool. Even with 1/4" tools I try to get the speed down to 5000 rpm to save the tool from burning up but the wee spindle has very low
torque at that speed and has cost me a number of tools as a result.
So much so that I bought a second hand 2.8kW servo off Ebay with 12Nm rated and 48Nm overload at 3000rpm. Imagined I was going to run it with a sensorless vector
type VFD. That proved to be a mistake. My own experience and reports on CNCzone suggest sensorless vector drives work but well short of that than can be achieved by
a genuine servodrive. Theres the rub, plenty of good servos cheap but a mating drive is bloody expensive. I have spent the last two months building my own drive from
scratch and been a hell of a learnnig curve! Well on track tho...
If you want to cut metal, steel or tougher you will need a spindle capable of low speeds with plenty of torque, suggests an induction motor with gear or belt reduction
unless you can spend BIG bucks on a direct drive servo or async drive.
Good luck, keep posting, it great to hear how folks progress, and CNC addicts them!!!!
Craig
My wife left with my best friend...
     and I miss him!

Offline Davek0974

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Re: Educational Sources???
« Reply #34 on: February 16, 2016, 03:37:22 AM »
Thanks, I'm mostly heading for small cutters in aluminium so will see how it plays when i get going.

Specific questions related to say 3mm aluminium cutting....

Holding tabs - would you use these on small internal features like holes etc, say 10mm x 20mm cutout or just let the scrap part loose?

Holding tabs - outside edge/final cut how thick should they be, I am guessing at maybe 0.25mm based on my experiences on the manual mill?

Spoil boards - when doing aluminium, what would you place underneath to cut into presuming you want full depth cutting with tabs?

Z Zero - Say i have a 2mm endmill in the collet, how do you set the surface zero on a router/mill?

Thanks

Offline ger21

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Re: Educational Sources???
« Reply #35 on: February 16, 2016, 07:09:56 AM »

Z Zero - Say i have a 2mm endmill in the collet, how do you set the surface zero on a router/mill?


Auto Zero macro.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline Davek0974

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Re: Educational Sources???
« Reply #36 on: February 16, 2016, 07:32:22 AM »
Ah, but what does it use for height sensing??

Offline ger21

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Re: Educational Sources???
« Reply #37 on: February 16, 2016, 07:41:52 AM »
A simple plate wired to an input.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline Davek0974

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Re: Educational Sources???
« Reply #38 on: February 16, 2016, 08:04:32 AM »
Sounds good,

I gather thats a plate of known thickness which is allowed for in the routine pretty much like the switch offset in plasma cutting IHS?

Something like single-sided PCB - insulated from the bed?

Offline ger21

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Re: Educational Sources???
« Reply #39 on: February 16, 2016, 08:14:42 AM »
Yes, if your working with a mill. For a router, I just use a piece of aluminum.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html