Thanks. So what do I need to look for in terms of spec. What kind of motor construction and motor driver ? I could lash up a hand drill as Peter suggested but they usually have ridiculous amounts...
Type: Posts; User: reg.miller
Thanks. So what do I need to look for in terms of spec. What kind of motor construction and motor driver ? I could lash up a hand drill as Peter suggested but they usually have ridiculous amounts...
Hi,
I have a CNC milling machine with a three-phase chinese 2kW / 24000rpm spindle controlled by a VFD.
It is fine for milling wood/ali/steel .
I don't do much work on steel because the...
Thanks, that makes sense. Forcing a stop is a crude way of reducing the cutting speed for that part of the path, meaning smaller chips and in general a finer finish. So long as that does not harden...
thanks. So that looks like surface feet per minute and thou per tooth.
For top flight software I'd have thought a speed would be marked in coherent, physically meaningful units, not "per minute"...
Thanks for adressing to the question. :)
What is PM,PT ?
Does "const removal rate" option provide for a near constant tool tip cutting speed between straight lines and corners?
Why would I want to stop the job and how would that prevent the tool cutting speed from being several times the feedrate in arcs?
I was sure it was done a looong time ago by loooooots of people. That is why I was asking what methods were used. That was the start of this discussion.
I have now modified FreeCAD to...
Yes, for simple forms, I find I often hand code rather than waste time configuring CAD. I get cleaner faster code with less unnecessary retractions.
What I'm saying is that there is no shock because of a tangential arc. There may be a shock coincident with a tangential arc for another reason.
So your solution is to hand code the change , not...
engagement angle is important but it is not another name for cutting speed. On the first cut in a slot the engagement angle is 180 even on the straight section. That is not what is determining the...
There is no shock transitioning from a straight to a tangential arc. The principal question I'm trying to find out about is how this massive increase in cutting speed over feedrate is handled.
If...
I'm aware my software is not handling this well. That is why I am trying to find out how this is usually handled in a more professional context. FreeCAD is FOSS, and this seems like something which...
So without knowing spindle speed or the number of flutes , you think you are qualified to tell me it is "rubbing".
Wrong.
180mm/min with full tool width and 2mm depth was throwing decent size...
Thanks Peter.
A change of 300% in cutting speed is obviously not good. It either means the straight sections are 3x too slow or arcs way too fast.
I got caught out by this when I set feedrate...
Hi,
I was wondering how to better control feedrates on G2/G3 arcs when tool radius is more than half the arc radius.
For example. I have a 12mm slot with semi-cylindrical ends. I want to cut...
Thanks I'll test it when I get a chance.
Why would the machine not do what I told it? Are there "smart" Gcode interpreters which think they know better and refuse to follow gocde instructions ?
I want to keep clearance height, so I'd avoid a G0 between drillings and use G98. That makes an extra move but it's a rapid , so doesn't cost much.
G0 Z5 (CLEAR CLAMPS)
S2000M3
G98
G81 Z-0.875...
Thanks GG. Your second suggestion just occurred to me after posting. That fits the bill.
I was wondering whether it was possible to give R below but that will crash at G0. Two ops is the way...
Hi,
I have a deep hole which needs pecking to remove chips/swarf. I would like to keep the tip of the drill just inside the hole to prevent degrading the opening by multiple re-entries of...
Mine has a jumper you need to move if using Vin as the speed control.
Hi,
when I looked at the CSMIO IP-S manual I did not see a specification of 24V , this seemed to indicated in wiring diagrams , often in brackets. From the chip datasheet we see this is NOT a...
Where is this 24V coming from ? I'm not sure the digital inputs will like 24V.
CSMIO IP-S show 24V as an example that does not mean it requires 24V. It says output driver is VNQ860
...
If you want to call someone pathetic, it's best to learn how to spell if first , mr. perthitic. :wedge:
Wrong. A small voltage can lead to a high current across a near zero resistance. This DOES...
Don't let preschoolers or vulnerable people like Joe Biden use your CNC. You should be good at 30mA ;)
I don't know if the "damage" comment is supposed to refer to shorting the induced spindle...
I have a pretty similar combination. Running on domestic single phase 220V supply.
Where does that 6000 rpm come from, experience or spec ? I got a fairly complete manual with the VFD but...
Yes lots of good kit in US is pretty inaccessible, even most firms won't ship outside US/Canada. Maybe this will change with whatever trade deals are put together but I think it's mainly about...
First of all NEMA17 and NEMA23 are standards for the physical mounting dimensions they are NOT a stepper motor. Your statement about specific motor type and geometry are NOT part of the standard and...
Hi, it's very similar to the one shown in this thread:
https://www.cnczone.com/forums/spindles-vfd/129454-water-cooled-chinese-spindle-disassembly-2.html#post1093542
In the top centre photo, it's...
Don't worry, I did not drill the moving parts. Just the static ring which is screwed over the bearing block.
It does now run with out tripping out but I have yet to seal it up and refill the...
Many thanks, it's invaluable having someone who knows what these things are like inside.
I had to drill a small hole in the guard ring to get clear access to allen screws behind it and have been...