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Thanks mactec.

I am not getting your power supply comment. This is unit with a single phase 230 V input and three phase output, max 400 Hz. Do you mean how stable is 230 V on input? No issue here....

Hi,

this unit has worked 4 years like a charm. Recently I have noticed that it does not hold set RPM under load even sometimes without a load. I mean, RPM set to 12k, actual speed varies from 11k...

Amana Tool´s RC-2250

No problem here. I have never thought my build can possibly inspire someone ;)

Any particular reasons for placing Y rails to extrusion sides instead of placing them on the top?

Hi. What a similiarity with my build ;)

Why to buy batteries? I bet you have 5 or 12 VDC power supply in your build available. One more cable in drag chain...

awerby, that vortex air chiller is realy nice!
nlancaster, thanks for your specific info. So your chipload is 0.127 mm (0.005"), all right.

I bought single tooth cutter with polished edge...

Hi,

I cut my first aluminium parts to replace temporary MDF parts on my router. What looked like a success first to me (no broken cutter, nice chips, cold cutter after machining), turned into a...

I definitely prefer dry processing, but out of curiosity I will give it a try.


Meanwhile I found information that for extruded acrylic there are single tooth cutters with polished flute with...

I have 2.2 kW chinese water cooled spindle that does no have enough torque below 6000 rpm, from what I read. 8k rpm seems to work fine.


Yes, that is was my case, slot width = tool width,...

Hi,

I have problems cutting acrylic - melting and wrong chip formation. Used acrylic is extruded acrylic (Evonik brand). Used cutter is CMT 188.050.51 (5 mm (0.2") single flute solid carbide upcut...

I already got XLRs for stepper motors. And probably will use Cat5 Ethernet cable and RJ45 connectors for limit switches, e-stop buttons, probe...

Thanks Roger, I will wire ENA signals to stepper drivers to disable them when e-stop button is pushed.

When Mach is informed about e-stop being hit, it stops to generate step signal for drivers so the motors stop immediately and hold position - lets call this a controlled stop.
But what happens when...

So it cuts off the power to motor so motor can be safely disconnected from driver, right? Reasonable usage.

I was wondering if the ENA signal can be used as an extra safety measure in emergency...

Slowly getting back to project...

Do you connect Enable signal (ENA) on your stepper motor drivers? User guide for my Leadshine drivers says "usually unconnected (enabled)". Does this signal has...

AFAIK, letter after "ERxx" should designate the clamping nut type. I am not sure about "B", but these are others:
http://www.rbh-tools.com/upload_files/tooling-system/ER11.jpg...

https://github.com/grbl/grbl
https://github.com/winder/Universal-G-Code-Sender

Roger, the probe itself has 1x/10x switch, did not realize.

Al, you posted that PDF in post #14 - I tool RC calculation formula from it.

When I disconnect the contactor coil, USB speakers connected to my PC make an awful noise. I will write back once I get the snubber and test it.

Btw, I have available oscilloscope, but it is Cat...

Worshipping your thumb. I will buy snubber with mentioned values. Thanks.

Roger, the problem is that I do not know which one to choose from available snubbers - see that Farnell link in post #23. I hoped that basic math will suggest which snubber to buy but now I have no...

My understanding: Assume the feed rate is constant. The bigger DOC, the more material must bit remove per rotation. If spindle does not have enough power to keep torque, rpm decreases and bit must...

To put my two cents in, start with determining optimal chipload for your specific bit and material you cut.
For example, open this Onsrud page and one of Plywood Cutting Data documents.
You will...

I got my contactor and measured it:
DC coil resistance: 3600 Ohm
Current: 0.013 A AC @ 240 V AC @ 50 Hz

If I use calculation from the PDF you linked, C [measured in uF] = I^2 / 10 = 0.013^2 / 10...

9-pin D-sub might be OK for stepper motors, but not for 3x 230V + 1x ground comming from VFD to 2.2kw spindle I guess. Am I wrong?
I will use XLR type connectors for stepper motors.

Thanks, idea of pulling out cables from fully populated box and routing them back is not really tempting!

What about the spindle cable? I want to keep it in one piece directly connected to...

If the electronics box will be attached to base table frame and never relocated, are there any reasons to place panel connectors on the box?
I mean, are there advantages if I connect cables from...

Datasheet for contactor that I will receive tomorrow specifies only the coil driving voltage. I will measure the coil and do some math to get basic idea on RC values. Thanks to both of you.

AC coil will be the only device on control relay contacts. What is the purpose of RC snubber in this case? To minimize interference when switching off the coil or to protect relay contacts? The coil...