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Thanks,

That's helpful.

I ordered the P4's off eBay, the seller accepted my $50 offer, so they should be on their way shortly.

One of my buddies tells me the way he sets the preload on these...

Craig,

Thank you for the links.

I still have one more question....

My understanding is that these bearings will either have slightly wider inner races, or slightly wider outer races, and...

Search for matched 12x28x8mm angular contact bearings is not yielding much, source?

I'm on a quest to get the backlash on my machine under 0.001" or as close as reasonably possible.

This is an older 8x30 knee mill with new Chinese rolled 1605DFU ballscrews and double nut.

With...

I have a double (anti-backlash) nut (1605) that was removed from a ballscrew and the balls went everywhere. I think I rounded most of them up but who knows? In total I have 31, so say 5 per circuit....

My past CNC conversions used stepper motors so were inherently slow.


My latest conversion (8x30 Knee mill) with DFU2005 and DFU1605 ballscrews uses 750W ac servos, These are a world different...

A transformer in buck mode can actually be reasonably small because the vast majority of the current only flows in one 20V secondary winding. The $20 transformer (visible in the control box image...

The drive has a factory set upper limit alarm (that shuts the drive down) at 242V.

Craig,

For reliability we don't design to nominal voltages, we design to worst case, as stated the utility specified tolerance is 240V + 6% , resulting in 360Vdc, These drives have a 350V bulk...

According to tech support, you should under no circumstances exceed the absolute maximum of 242V, and in fact the over voltage alarm in the drive will be triggered at that level. This is not a Delta...

I thought I should provide an update on this servo selection thread I started now that I have selected and installed some of the servos.

I decided to take a chance with StepperOnline T6 ac servo....

I'm not sure what's up with the leadshine website, but when I tried to access to download the EL6 manual etc. MalwareBytes warns me that it's not safe and is attempting to place a trojan on my PC. I...

I would actually enjoy digging into manual tune for educational purposes if I could get useful answers to my questions from tech support. So far the responses have been polite but rarely answer the...

Craig, Wes

Craig, thanks for the confirmation on Jlinear. Your point about the inertia contribution makes complete sense. I vaguely remember doing these calculations in first year (1980's)

I'm...

Craig,

Your thoughtful response is much appreciated. The inertia ratio was just a pie in the sky value that I entered to see what would happen. Picking up from your example, I’m going to focus on...

Perhaps I'm getting old and slow but I find the documentation for MotionStudio to appear at first glance to be simple and straightforward, however when actually using it it's not clear what the...

Response curve as is:

My control theory (PID loops etc.) is long forgotten it was 40 years ago. My understanding is that ac servos are a bit more finicky to tune than dc servos partially because they have wider bandwidth...

Good point. I have been busy with ballscrew and servo modifications (almost complete) and so I'm thinking ahead to next steps. With my old mill I used a touchscreen but much preferred using actually...

Years ago I converted an old round column mill to CNC, at the time I was not thrilled with the pendants available and the thought of the pendant constantly falling on the floor etc so I made a custom...

Craig,

Thank you for taking the time to post a fantastic and informative response. I particularly like this point:

There are very strong and vociferous adherents of each of these solutions,...

I need to make a decision on CNC software for the new mill. I have used Mach3 in the past, so I'm quite familiar with it. Some obvious competitors are Linux CNC , Acorn, UCCNC, others?
...

I contacted DMM, they want US$600 per axis, that would be CDN$3300 and that's more than I paid for the entire mill.


I did find T6 series ac servos at stepperonline...

joeaverage,

Thanks for that. I'm located in Canada so I should probably look at the DMM brand.

Anyone have experience with DMM servos?

Newbie here.

Preamble:

This is for hobby use not professional.

I have two manual mills, I converted one of them to CNC about 10 years ago using NEMA34 steppers and using Mach3 to control. I...

I have some logic in PoBlocks that needs to know if the jog(tab) display is active or hidden. I actually have a register in poBlocks, however it gets out of sync with the actual window, so I need a...