8x4 router build. Steel base & Aluminium gantry gantry

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Originally Posted by D-man

I'm not sure I follow what your saying pal... I understand removing the vertical from the centre and putting a cross base in as the sides. Are you saying not to use the 9 cross members on the top now? If so what would be the best way to mount the extrusion

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Ok well seeing your other post about already ordering stuff and the fact I can't be arsed to explain then just crack on. . .Lol

The controller you want for servos is the IP-S because of it's much faster frequency that high count encoders require to get the best from servos.

BUT just for clarity then the latest IP-M Beta Firmware now does slaved motors, all be it in a cut down way to the IP-S. (I haven't tried it yet so can't vouch for how well but I will and report)
The way the IP-S handles slaved motors is different to typical way slaved motors are done with other controllers in that when it hits the switches it's got an option to measure the difference between each switch contact then applie an offset movement to one motor to square the gantry. That said with servo's you'd home using the encoder index which is much more accurate than switches but it works well for steppers without encoders.
Other controllers like the ESS require you to manually adjust the switches to square the gantry.!

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Originally Posted by JAZZCNC

Ok well seeing your other post about already ordering stuff and the fact I can't be arsed to explain then just crack on. . .Lol

The controller you want for servos is the IP-S because of it's much faster frequency that high count encoders require to get the best from servos.

BUT just for clarity then the latest IP-M Beta Firmware now does slaved motors, all be it in a cut down way to the IP-S. (I haven't tried it yet so can't vouch for how well but I will and report)
The way the IP-S handles slaved motors is different to typical way slaved motors are done with other controllers in that when it hits the switches it's got an option to measure the difference between each switch contact then applie an offset movement to one motor to square the gantry. That said with servo's you'd home using the encoder index which is much more accurate than switches but it works well for steppers without encoders.
Other controllers like the ESS require you to manually adjust the switches to square the gantry.!

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i like the sound of that! Do they require much setting up and wiring like steppers do? If you like I can get them, you can do your review and then send them back all wired up ready to go haha

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Originally Posted by D-man

i like the sound of that! Do they require much setting up and wiring like steppers do? If you like I can get them, you can do your review and then send them back all wired up ready to go haha

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If your talking about servo's then yes and no. Yes there's still signal wires from drives to controller but from drives to servos then you'll buy cables ready made up.
To be honest derek if your not familiar with servos and PID tuning which can be tricky at times then you will be better sticking with steppers as they are simple easy and just has accurate if sized and run within there parameters.
Yes modern servos and software are making it easier to tune them but compared to steppers there is still much more to them and more to wrong.!!

And No before you ask.!! . . . Lol . . . Far far too busy.

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Originally Posted by JAZZCNC

BUT just for clarity then the latest IP-M Beta Firmware now does slaved motors, all be it in a cut down way to the IP-S. (I haven't tried it yet so can't vouch for how well but I will and report)
The way the IP-S handles slaved motors is different to typical way slaved motors are done with other controllers in that when it hits the switches it's got an option to measure the difference between each switch contact then applie an offset movement to one motor to square the gantry. That said with servo's you'd home using the encoder index which is much more accurate than switches but it works well for steppers without encoders.
Other controllers like the ESS require you to manually adjust the switches to square the gantry.!

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Good to hear that the IP-M will support slaved motors soon. If that had been the case 12 months ago then i'd have jumped on it rather than the PMDX/ESS combo.

For reference though, the last few plugin versions for the ESS (ESSv10r2d1d being the latest) support misaligned home switches. You can now apply an offset in the 'advanced homing config' dialog rather than having to physically adjust the switches.

Attachment 13911

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Originally Posted by JAZZCNC

BUT just for clarity then the latest IP-M Beta Firmware now does slaved motors, all be it in a cut down way to the IP-S. (I haven't tried it yet so can't vouch for how well but I will and report

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Now that's great news.

Well, I've managed to get a good start on the machine over the past couple days. This thing is solid!

Attachment 13937Attachment 13939Attachment 13938Attachment 13936

What a beauty. My heart warms looking at big steel structures :hysterical:

Thanks, I have the same warm heart feeling haha gets warmer when I try and move it. Haha

Decided to go with Adtech servos and drives. With the edingcnc board.

Looking great - very purposeful, workshop looks soooo tidy, but I guess it is your works unit and not your garage.
Well done.G.

Cheers G,

TIDY... you should see behind the camera haha

Wow that was fast!

Let me know how you get on with the adtech servos I was thinking about using them on my thermwood router retrofit.

Will do Gav,

What can i say, i fabricate every day, however its been a quiet week, plus the fact i ad them cut to size haha +/-2mm so was a case of trimming them up and welding. the welding took some time due to having to jump on different parts to stop and warping etc.

Love the Trolley jack Big "D" precision engineering at it's best. . .:hysterical:

Regards Servos then good choice but the EdingCnc software I think is shit I just can't get on with it.! . . . Also which board is it because last time I looked the fastest board they had was only 125Khz which will be restrictive to RPM with servos with high count encoders.?

IE: Presuming 3:1 gear ratio with standard 2500ppr quadrature encoders so 4x 2500 = 125000/(10,000x3)=4.16 rev/sec x 60=250Rpm you'll get from Servos before frequency runs out.!
To get full 3000rpm which most servos run at you'll need 1.5Mhz frequency with 2500ppr encoders.!! . . . . .Unless you use electronic gearing but then you lose resolution so it's a trade off.!

Yeah was proving difficult to hold one side of the steel up whilst trying to get it level haha

and regarding the board.... shit! this is the one... http://www.edingcnc.com/products.php?productid=55

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Originally Posted by D-man

and regarding the board.... shit! this is the one... http://www.edingcnc.com/products.php?productid=55

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Sorry to shit on your parade but Nah that won't cut the mustard with servo's I'm afraid.
I've got the CNCUSB card which is essentially the same but without Ethernet and the software is shite for me. It's personal thing I'm sure as others like and use it fine but for me we just don't click after using Mach3.!

For steppers the card will work fine and even at a push low count Servo's with electronic gearing but to me one of the points using servo's is increased resolution and accurecy. I also like some overhead so things are not stressed or struggling to keep up when at full chat.! . . Which 125Khz and servos would be most all the time.!

hi d-man i wish to make a bigger machine, do you work from plans are do you have some idea in your head that you work with...thanks viper wallsend

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Originally Posted by viper

hi d-man i wish to make a bigger machine, do you work from plans are do you have some idea in your head that you work with...thanks viper wallsend

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Derek (D-man) gave up with the build in the end I think and bought a chinese machine, well actually think was from radecal but they are just Chinese imports with there stickers on.!!

thanks for your quick reply