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Hi, Thank you really much for this Video. I have the same Motor and driver with a BT30 spindle over 1:2 Belt reduction. Before I had the spindle in analog speed mode before, but now I need positioning. I had the wrong and incomplete manual without extended control parameters or any information about the tuning so I tried to adjust the Position proportional gain and other parameters by hand. That didn't change anything so thank you for the Manual and the explanation! As we have very similar systems please tell me which parameters you changed to what. Just the Pn 259 to something low like 1 or 0 or something else to get the values to work? I don`t need a really precise spindle position or dynamics just positioning for tool change.

Seria bueno este video pero en espanol

Is there a link to the build of machine itself

Looks like a nice comprehensive regrind

Many of the china servo drives come with (2) 2k 1/4 watt resistors......what are they used for?

Really enjoyed your post-restoration, I guess you could call it. Not sure if you have the original restoration but I'll check that. I'm in the middle of restoring an older lathe myself (Denham Junior MKII) so am interested in how others are doing, or have done, their projects. The cross slide nut mod is a very interesting idea, although I have had to purchase an ACME thread and will splice mine together, as the wear is in both the screw and the nut. But will certainly keep that in mind.

Can you post more information about the signals you are scoping? How do you get an analog signal from the encoder data?

Man, thank you for such lesson. I am using the exact driver as your datasheet -aasd15a. I didn't have good experience with the Pn257 adjustment. My calculated inertia mismatch is 31 but it work perfectly withe Pn257 = 1. I run the system the Fn018 function, the driver estimate my system inertia as 8. I input that value to pn257. The motor still rotate, but it was rumbling as well. This is scary! I did not dare to adjsut Pn257. Can anyone provide me some tips? 😢

Don’t make excuses for what your doing good work 👍🏻

Hi! Love your elaboration on the topic! Is it too much to ask, if you could put these formulas into a google spreadsheet or excel file, so each weight/pitch/torque can be adjusted for each type of machine? It would really help me, as this math is a little bit overwhelming.

Back in 1980, before I emigrated to OZ, I bought a 1930 model Colchester Bantam lathe from a guy who did furniture restorations and wasn't into lathe rebuilding....cost me 75 pounds then complete with 3 jaw and all change wheels.......when I got it to OZ, and after reassembling it, I did a test and it had .013" wear on the bed from the chuck end up to the middle, impossible to run it that way or adjust the saddle gibs etc........so as a regrind was out of the picture I made a hand powered bed planer and recut and scraped all the ways in and refitted the saddle and tailstock, that took 2 months of every night doing 3 hours. I still have the lathe and being retired now 20 years use it regularly on and off.

Hi Vhosher that sounds like the best path to take, can you tell me the one you got or which VFD to buy for the Bantam? Thanks for all your help and advice

Hi after watching your great video l got myself a Bantam. Could you please tell me if the motor on yours is single or 3 phase ,as l need to convert mine to single. l need to know which motor to purchase? Again many thanks.

Excellent video, i have a Chipmaster which has some similarities to your Bantam. To mount my lathe on the floor, i cut holes which matched large steel box section, filled them with concrete and mounted them to the concrete base below the wooden floor. I may have to take your excellent idea on the backlash as mine suffers also.

Sorry, not only cast iron moulding rocks. Your UCCNC BOB rocks as well! :) And some other things. Great channel. Keep it up! Thanks.

The only think that surprised me in negative way is the fact, that you've put so much effort to make such a nice, stiff, massive, rigid gantry and them pick such a shitty rail guides ffo the table. Gteat channel, and cast iron melting you did rocks!

Gresat work, great video. Respect fot melting cast iron!

And this is actually the most serious approach to servo selection in DIY cnc world i've seen so far. Keep it up mate! Subscreibed!

Initially i was thinking to use one servo and two HTD 3M belts to drive two ball screws. Now, after the lecture from you, i'm concerned if such a long belts will do. And then anothe concerns came in: if i use two servos for X axis - how to hook them up together/synchronize so they run in parallel without skewing my gantry!? What if one servo fail, issue error signal, but it will take time for the second one to stop/trip...

Hi could you please tell me which model of Colchester Bantam you have. Many thanks

hello, may I ask what is the Cross Slide Leadscrew Nut modification for?

Which mach 3 board u used sir the red color board.

I started with woodglut plans.

What a cool TH-cam channel. Subscribed and looking forward to new videos

How does the drive able to maintain " constant torque " at different velocity .

This is the first lathe restoration video I have seen that was actually worth it.

are you planning to work on EtherCat BOB for mach4 in future ,this is awesome job

Hi great video i have been looking for a company to re-grind my lathe bed in the UK wondered if you could share the information. Kev

I keep seeing these flexible couplings. I have been using them for 40 years but _never_ for torque-transmission, only for coupling encoders to shafts. To me, using these things for motor coupling is lunacy....might as well use a rubber band for a drive-belt.

Surprise surprise, there is actually a software that can connect through serial port to these drives.

stiations??? I think you mean stRiations lol

I can see the lathe was ground on a Churchill so I’m guessing unislide

Subscribed as soon as you played MC Hammer after pouring. Is that your foundry? Maybe do some more material on iron casting in DIY scale: how tools and methods differ from aluminium casting?

I forgot 20 input 20 output for Mach3

Hi can you create a I/o expansion board for Mach3 I like to buy it

Dear friends, thank you for your support to CNCSERVOCONTROL.COM products. We have the English version of the manual, please send an email to ytb[@]cncservocontrol.com and we will send it to you immediately The only official website：www.cncservocontrol.com

Excellent work. Great tip on splitting the cross slide nut.

Pid, pid, pid..lol

im just getting started with these chinese servo motors and I am trying to hook up the centroid acorn encoder plug to the servo driver, and i dont know where to plug in the 5+VDC from the acorn into the servo driver. i just dont know where to plug the a+a-b+b-z+z- 5+VDC and GND from the acorn into the 110_m06030 driver. could you help me know where i should plug in please? do I use the db25 pin 22 to connect the 5+VDC and pin 1 to the ground?my manual shows pins 15,16,17,18,19,20 for a+,a-,b+,b-,z+,z- and pin 22 is z open collector output and pin 1 is GND my problem is that I dont know where to plug the 5+VDC from the acorn to the servo driver, would I just plug the 5+VDC into the z open collector output pin 22? because that is the only pin that is left over to use. please help thank you.

Hi, I have a question regarding the lathe bed: you have completely disassembled the lathe , can you tell me, please, if it is possible to remove the screws that hold the bed to the stand together without disassembling anything else? ,thanks, Alberto

Top work!!

Nice work young man. I shall subscribe!

Good morning , and congratulations for the video, is really well done and complete: I have a question about the Colchester Bantam Mk1 lathe, I see that the lathe is separable from the base , it would be very convenient for me to place the lathe on the bench I have at home and which already supports a 350 kg heavy lathe (the table's capacity is 1000 kg), for the electrical part there are no problems, because I will apply an inverter and possibly a new motor, but I don't know if the lathe can be used separated from the base! May you confirm to me ? Thanks in advance for your reply, Alberto.

Nice board .. are you considering a production run of this board ?

Thank you

Did some testing in steel, too. Try adaptiv, it works for me.

As if by magic! I am literally tuning these very servos this coming weekend! Thank you for such an interesting video. On your estimation of stiffness in the belt: I would have intuitively thought the same (that belt systems are not very stiff), but a counterpoint I have seen recently is a yoke of a 5-axis CNC machine driven by a poly-v belt. Apparently that belt is sufficiently stiff to support a huge A-axis, which blew my mind. Anyway, thanks for the video :)

Looking good - Excited for next months colab 🤙🤙

Sick video as always my dude!

3:58 - “I have inherently, not a lot of stiffness” - You and me both brother.