[Formantjim]

Have a Tree 325 and reading the label printed on the side of the Baldor servo it states 100V DC and Peak current 12 Amps does anyone know the continuous power draw for these servo motors?

The label also has a torque value of 500oz per inch again is this continuous or peak? The reason for asking is we are going to be replacing the servo motors for Clearpaths together with UCCNC controller and need to know these values to choose the right servo..

[joeavaerage]

Hi,
can't really tell, but the continuous power output is typically 1/3 of the peak output.

The peak power output is 100 x 12 =1200W, and you would guess the continuous power would be 400W. Is there ANY other data on the nameplate? Something like the Voltage constant or the
Current constant, even rated speed?

Lets assume the 500oz.in is rated torque.

500oz.in=2.6ft.lb
2.6ft.lb=3.7Nm

That would suggest if the rated power is 400W (guess) and the rated torque is 3.7Nm then the rated speed is:

Rated speed (rad/sec) =400/3.7
=109.2 rad/sec = 1042 rpm.

Does that sound about right? Is there any data that might prove/disprove this guess?

I use 750W Delta B2 series servos. They have a rated speed of 3000rpm at 2.4Nm. They have a peak power demand of 2.25kW and a peak torque of 7.1Nm.
I par $438USD plus shipping for them. Bang for your buck they handily out perform Clearpath.

Craig

[Formantjim]

Many thanks for the fast response. I maybe should have explained a little more of the project and my thinking. This machine has sat for many years but was fully functional when purchased but we'd like to get it operational again.
My intent is to rather try to fault find the driver boards and then replace all the capacitors throughout is to start with modern up to date servos that just need a power supply. I have personally built a CNC machine 6 years ago using the Clearpaths and could not be happier with their performance. Instead of trying to learn conversational language of the Delta 20 controls this would be replaced with a touch screen PC that is networked running UCCNC that too has been extremely reliable and accurate. I know there is going to be a lot of people who are going to be upset with me for not refurbishing an old machine but quite frankly I do not have the time or the will to do it.
The cost of the 750W Delta B2 servos might seem attractive against the Clearpath but I don't need to purchase a driver for them. All I need to know is which Clearpath is best for the machine. I have been conversing with Teknic who have asked a lot of questions some I can answer some I cannot hence the call out to this wonderful forum.

[pippin88]

Modern servos are usually sold in a set with driver, servo motor, and cables.

The price quoted above is for a set with driver, servo motor, and cables.

[joeavaerage]

Hi,

The price I quoted is $438USD for the 750W servo, the servo driver and 3m cables, ie a kit. I've bought four this past year at that price. The shipping to New Zealand is $156USD for three day Fedex.
To date the record is two days, twenty hours and 45 minutes from Hong Kong to my doorstep. The longest was four days nine hours. Still, that nearly 10,000km!

I use Mach4 and an Ethernet SmoothStepper, which is very VERY similar to UCCNC and one of their motion boards, you do not need a Delta controller, they are Step/Direction just like Clearpath.
Unlike Clearpath you don't need a power supply either, the Delta's are direct connected to 230VAC. Additionally Delta have vastly better IO with eight digital inputs, 6 digital outputs, an auxiliary encoder
output and two analogue outputs, can be run in torque, velocity and position modes, and has twice the power for a a little less than the cost of a 400W Clearpath.

I know there is going to be a lot of people who are going to be upset with me for not refurbishing an old machine but quite frankly I do not have the time or the will to do it.

Well, I'm not one of them. The old Baldor DC servos are not just yesterdays news, they are last centuries news. If you are going to spend money then I too would go for the most surefire solution,
which includes a CNC software solution like UCCNC OR Mach4 OR LinuxCNC and Step/Direction servos like Delta OR DMM OR Clearpath.

Sell the old Baldors to someone whom wants them, there is a plonker born every minute!

Craig

[Formantjim]

Thanks was not aware of the Delta kit. It might be the best solution to date.
The issue I've got at the moment with the Clearpaths is the diameter of the shaft being 1/2" and the Baldor is a tapered keyed shaft 5/8" what is the shaft size of the Delta? It would be nice if it were a drop in replacement. I'm looking into trying to find the power drive pully to use with the Clearpaths and was hoping that anyone reading this thread would chime in with a solution. I'd seen other Tree retro fit threads but no one mentioned the power drive pulley fittings. If anyone out there knows or has done a Tree retrofit I'd love to know of a solution.
Yes I started with Mach 3 and the ESS but had a few hiccups so switched to UCCNC and its been great.

JIM

[joeavaerage]

Hi,
the 750W Delta B2's have an 80mm frame and a 19mm keyed shaft.
The 400W Delta B2's have a 60mm frame and a 14mm keyed shaft.

I would guess the Baldors are genuine NEMA 34's (86mm) or Nema23's (57mm). Thus the Deltas are close but not identical. In that regard I think Clearpath are still inch dimensioned??

Yes I started with Mach 3 and the ESS but had a few hiccups so switched to UCCNC and its been great.

I personally am of the opinion that Mach3 is obsolete, not withstanding that it still works and has a loyal fan base, but all development ceased on it eight years ago. Mach4 and UCCNC are very comparable.

Craig

[Teknic_Servo]

Hi Jim,

I’m an Applications Engineer at Teknic. I came across this thread and thought I may be able to add some additional information.

I’m glad you reached out to Teknic directly, and if you’re struggling to find some information requested by the applications engineer you’re working with, please let them know. There are often multiple ways to determine the right motor for an application even without complete information.

The issue I've got at the moment with the Clearpaths is the diameter of the shaft being 1/2" and the Baldor is a tapered keyed shaft 5/8" what is the shaft size of the Delta? It would be nice if it were a drop in replacement. I'm looking into trying to find the power drive pully to use with the Clearpaths and was hoping that anyone reading this thread would chime in with a solution. I'd seen other Tree retro fit threads but no one mentioned the power drive pulley fittings. If anyone out there knows or has done a Tree retrofit I'd love to know of a solution.

I recommend exploring the use of a bore reducer to go from a 1/2 inch shaft to a 5/8ths inch input diameter. Bore reducers are a common and cost-effective method of adapting mechanics to work with alternative shaft sizes, and are typically straightforward to source (here's an example: https://www.ondrivesus.com/bore-redu...ass-aluminum#1).

To address Craig’s point regarding frame dimensions: ClearPath motor frames adhere to the NEMA ISC-16 standard. In the standard, motors referred to by frame numbers have imperial dimensions (e.g. NEMA 23 (2.625in), NEMA 34 (3.875in), NEMA 56(5.875in)). If the current Baldor motor conforms to one of these standard NEMA frame sizes, then the replacement process should be relatively simple.

That said, many motor manufactures choose to deviate from the standard for a variety of reasons. For example, Teknic decided to use a larger diameter shaft for increased torsional stiffness and because the increased shaft size allows us to use over-sized bearings (which extend the life of the motors and provide better radial and axial loading).

If you have additional questions, please don’t hesitate to reach out via our website (https://teknic.com/contact/) or give us a call at 585-784-7454.

Bradley N. -Teknic OEM Applications Engineer

[Formantjim]

Thanks Bradley for the comments sorry been off the forum for a few days. Anyway have ordered a Clearpath from you guys awaiting delivery in the next day or so so I will be giving feedback on the install.
Finding a power drive pulley for the Clearpaths has been a bit of a challenge but we've managed to find a local supplier so fingers crossed!

Moving onto the next topic is that of the spindle motor and drive even though the machine was fully working machine we've taken the decision to replace the the VFD with a more modern one with hopefully Modbus communication like my huyang VFD.
The existing motor is a Yasakawa UAASKA-06CA1 3.7KW speed looks like 1500rpm and possibly goes upto 8000 rpm. The motor is fully functional so would like to drive it with a modern VFD if possible. I don't mind changing it out to another one of equivalent HP together with a new VFD. I'm looking for suggestions here. I know Huyang VFD's get a lot of negative comments but mine on my DIY CNC machine has been excellent 3.5 years and counting. If not Modbus compatible then a standard 0 to 10 volts output as it will be controlled via a UCCNC ETH 300.