Denford Triac VMC with ATC Conversion / Fix

[Chaz]

Ok. It's working now. Had to check direction a few times. Lots of dirt in the pipes etc. Pump not healthy but manages some pressure now.

Can anyone link a fluid I can use mainly for ALU?

[Chaz]

So, not a trick question .... but would like some confirmation of what my X and Y steps should be. I have it very close but Id like to know how the number is calculated. I know the formula, but on the current info I have, the 725 value does not look correct.

The issue is that I dont know the config of the drives. I do not have access to them and therefore there could be a host of different 'steps per rev' measurement. could be a number of values.

So If I take some of these, I cannot match the value that I am currently using which is 725. This seems very accurate, I am getting measurements within 1% but I need to do more testing. I may have a bit of backlash which *might* account for some inaccuracy, certainly on my Y.

Please see the table below. I take a number of options and nothing matches 725. I then swap the gear ratio around and the closest I get is 819.2.

The third table (in green) I simply reverse engineer from 725 and get some random steps / rev, could either of these be correct?

The claimed maximum output from the driver manual is 1024, but am aware that this could be multiplied by 2 or 4?

Thoughts?

Thanks

[i2i]

for a stepper fitted machine, that has 400 steps per rev, and the gear reduction is 2.5:1, with the 5mm pitch you get 200 steps per unit in metric. For a 2:1 gear reduction it should be 160 steps per unit. All you have to do now is equate that to the steps per rev your motor has.

steps per rev / ( ballscrew pitch/gear reduction ) = steps per unit

If you have a bit of backlash check the angular contact bearings at the pulley end of each ballscrew, they may need adjusting.

Ps. don't forget to fold the tab washer flat to adjust the nut.

[Chaz]

for a stepper fitted machine, that has 400 steps per rev, and the gear reduction is 2.5:1, with the 5mm pitch you get 200 steps per unit in metric. For a 2:1 gear reduction it should be 160 steps per unit. All you have to do now is equate that to the steps per rev your motor has.

steps per rev / ( ballscrew pitch/gear reduction ) = steps per unit

If you have a bit of backlash check the angular contact bearings at the pulley end of each ballscrew, they may need adjusting.

Ps. don't forget to fold the tab washer flat to adjust the nut.

Thanks, so based on my pulleys being 12 / 24 (motor end / ballscrew end), 5mm screws, using 725 steps for damn near 100% accuracy, what do you believe the steps per rev is on the current IRT 1306 drives via the simulated encoder outputs?

[Chaz]

I have a favour to ask, not sure if anyone can help or suggest someone that can.

I bought a replacement drive from a vendor. Before I bought the drive, I asked if it can work with my current CS Labs and Mach 3 setup. I was told that it would.

Once the drive was installed, it was apparent that it would not work, not unless additional electronics was added as it does not output a suitable differential encoder output.

I attempted to get the drive refunded. The seller rejected this. Eventually he agreed that the drive doesnt work as I need and offered a partial refund. This was then upped later but not 100% as I requested.

Distance selling rules allow me to return the device however as this was a seller from EU (Finland), there is a clause that states that I can return only if the device / item has not been used.

I ended up raising a dispute with Paypal and forwarded them all the email correspondence that highlights that the vendor has accepted that the drive cannot output differential encoder outputs as needed (without building some custom circuitry).

Paypal have now come back and asked that I make contact with 'an expert' who can verify this. This is their request.

"Please obtain a document from an unbiased third-party, such as a dealer, repair shop, appraiser, or another individual or organisation that's qualified in the area of the item in question (other than yourself), which details the extent of the damage or clearly explains how the item received significantly differs from the item that was advertised.

This document must be on a letterhead that includes the name, address, and phone number of the individual, business, or organisation so that we may contact them if necessary."

I spoke to them at length this morning as I dont think this is reasonable. Why should someone, who has no role in this, assist me (at their cost and time).

I told them that the emails confirm what the seller had indicated. I was then told that emails could be altered. They offered a new option which was even more complex.

So, my question is, is there anyone that is either on this site or falls under the category of 'unbiased third party etc' that is willing to look at the info and put something in a letter than I can send to Paypal for the refund?

If not, Ill reluctantly accept the part refund offer that I had and cut my losses on this.

Thanks

[Gary]

Give me a link to the driver that you ordered.
Also did you get an email form them to say that it will work with the CS labs controller? I find it strange that a servo driver that accepts +/-10V and works with a resolver would not have emulated encoder output.

[Chaz]

Give me a link to the driver that you ordered.
Also did you get an email form them to say that it will work with the CS labs controller? I find it strange that a servo driver that accepts +/-10V and works with a resolver would not have emulated encoder output.

Thanks.

http://granitedevices.com/digital-servo-drive-argon

http://granitedevices.com/w/images/f...gonFlyerA4.pdf

http://granitedevices.com/wiki/ARGON_Servo_Drive

It does do some level of encoder output, but you have to add additional circuitry.

This is explained here:-

http://granitedevices.com/wiki/Argon_EXT_connector

Due to my lack of knowledge (at the time, not that I am now wise ;p), the drive cannot do differential encoder output. The seller of the drive (nice kit otherwise) indicated it can be done but not only do I need to solder into the drive to connect this EXT connector, I will need additional electronics. I believe (if I am not mistaken) that his method to create 'differential' was simply to invert the signals and present them for use. My understanding of differentials is that one of the reasons we use these is for error checking. If one of the feeds looks 'bad', it will compare it to the opposite one. Duplicating it is not exactly helpful as this wont work in this case.

At least, that is my understanding.

Any help appreciated.

Thanks

I am not sure if my lack of knowledge has been the issue here. In both cases I forwarded the seller both the IRT 1306 drive manual as well as the CS Labs manual to show exactly what I needed. I therefore assumed that the drive would work as I required.

My first email to them:-

"Hi,

I have had damage to my IRT 1306 drives. I have managed to repair 2 of them but the 3rd remains faulty.


The motor runs with revolvers.


http://shop.granitedevices.com/produ...vo-drive-argon



I believe that your driver should work. Do you have a single unit in stock? How quickly could you get this to me in the UK?


There are 2 resellers selling them but a 25-50% markup is not cool.


Please help.


Thanks"

Their response (removed their contact details):-

"Hi Charl,

Thank you for your inquiry!

We have few Argons kept in UK warehouse stock for urgent cases. Please let me know if the need is urgent and I can arrange you one.

Best Regards
Granite Devices Oy Finland, www.granitedevices.com"

My response to this:-

"Yes, please !!!

Can you just quickly confirm that this should work with my current system? It uses IRT 1306 drives with resolver input. That drive then outputs as encoder output which is then taken by the CS Labs controller. Ive attached the drive specsheet for info.


What do you need from me to process this and arrange postage for tomorrow or Saturday at worst?


Thanks
"

And their response again:-

"Hi Charl,

We can ship today with express courier if ordered ASAP and it would probably deliver tomorrow (but there is always uincertainty if it makes there in one day, or if theyre is saturday delivery option).

I quickly checked the pdf and the drive looks quite close to Argon. Do you require also encoder output from the drive? This feature in Argon has few limitations, see: http://granitedevices.com/wiki/Argon_EXT_connector

I hope to hear from you soon!"