Search:

Don't use energised relays to connect the stepper to the drives, if at any time the relay faults and disconnects the steppers it'll destroy the drivers.

You could also add a contactor wired across the NTC set with a 5 second delay to short out the NTC once it's done it's job as it doesn't need to be burning power all the time.

I also wish I had time to contribute but I am very interested in the project and watching with interest.

I too have benefitted from your knowledge, I thank you Mihai for making the project open source. Please don't be put off posting projects just because one individual feels the need to bully people...

Sweet! Just what I need. Cant wait to build it..

Thanks
John

Hi Mihai, I'm still waiting for delivery of the ST32 module and currently sorting the pcb design, I see that your schematic shows current sensing off of R25, What's the max current threshold...

Great work with the bushed dc motor, What's the maximum stepping freq with say a 500 ppr encoder attached?

Hi Mihai, Great project, I thought I'd have a go at building it. I've ordered a STM32F103C8T6 module and parts to make the driver for a DC servo.

A quick question, My DC servo operates at 75v,...

The build is looking good.

Not sure about using car style rams for the knee though, that knee is pretty heavy and whatever you put on the table is going to add to the weight. The ram or cylinder...

Hi, No i didn't cut anything away, it's been a few years now but if i remember all i did was to grind away some crud under the knee. I mounted the cylinder in the same position to the hafco thread...

I have the same mill I converted to cnc. Things to be aware of, completly strip the spindle and remove the powdery grease and replace with decent spindle grease, about a week after I got mine I...

Hi, I've just finished my mill cnc drive using Gecko's. I kept all the low power 0v lines going direct to the low power board and the high power 0v lines to their respective power supply caps. I then...

Hi mif73, Your problem may be the built in Intel video card using up resources that Mach needs.

Somewhere this has been explained and the Mach guys have said on-board video can cause problems. Try...

Hi, You could use a large contactor with normally open contacts with an addition of a coupled unit (that slides on the top of a normal contactor) with normally closed contacts.


Connect the NC...

If you cannot find any high voltage ones you can connect capacitors in series, so if you found some 22,000uf @ 100v you can connect 2 in series which will handle 200v but roughly halve the...

Hi Chich2, Nice work mate. Yes I do intend to do a project log of my mill. I've got lots of photos as I've progressed and as soon as I've completed the axis's I'll start putting a log together.
...

Hi, Just a thought, Does the compressor have a slow start device on it.

Where I live the supply is notoriously bad as I'm surrounded by farms and frequent brownouts and under-voltage. My...

Hi, Getting high revs from steppers is a function of voltage so raising the voltage will enable you to get more speed. Having said that, you will find larger steppers will not rev as high as smaller...

Thanks Chick2 for your quick response. You put forward some very good points. I like the idea of driving the knee from the column. I'm pretty set with the ram idea because it's easy and simple to do...

Hi Chick2, I've been reading your post since a year ago I happened to
purchase a similar mill to yours, a ZX7550 what ever that is.

It just has the vertical spindle and the usual Chinese...

Hi, Short answer is no, well sort of. If you attached a loop terminal on each end of the green wires from the drives and a terminal on the incomming earth wire and each lug was secured together on...

Hi, I think if you wire 2 pins together for each wire on a DB9 connector should be ok. I'm sure read somewhere on here that each pin can take 3 amps max though don't quote me.

Do a test first, if...

Hi, The most scientific approach to tuning Gecko's is to open the case up and find the set-point pins and apply an oscilloscope to view the set-point waveform.

I'm buggered if I'm going to undo...

Good on yer mate. Congrat's.

Hi, Could anyone tell me if the Boxford TCL160 cnc lathe has a morse taper in the spindle.

I've been on the Boxford site and looked at the specs but no mention of it.


Cheers

Hi Good to hear you are progressing. Just a thought, Could you try changing the micros oscillator crystal to a higher frequency. Then you would know there is a problem with the chip or the code.

...

I belive the Gecko's can step up to 250Khz which is what .. 4us? So the off time of your pulse should be less than 4us.

That should provide the correct pulse shape to the driver.

Hi Eurisko, Yes you make a good point. I never thought of the time a tool bury's it's head in something. I guess I'm going to take advice from those circuits (Thanks for posting them Kreutz). No...

Hi, Yep you can take this info as gospel. The reason you probably havn't heard of it is that higher end servo drives ie: the expensive ones the big boys use, have a thing called a dump resistor built...

This might just apply to me but I though I might mention it as I was on the verge of tearing all my hair out, I cut 316 stainless quite frequently and use a tipped tool holder that has a 12mm shank,...