DDSCV1.1 3 and 4 axis offline motion controller

[Bubbles]

In the links in post #229 is a download for the English manual. On page 80 there is parameter #115 0=metric,1=imperial.

https://www.cnccookbook.com/g21-gcod...tric-imperial/

I don't find parameter #115 in my parameter page.

[Bubbles]

I don't find parameter #115 in my parameter page.

I have tried installing the latest firmware listed in that post but I don't have parameter 114 or 115 and possibly others.

I am guessing I am running an older version of the firm ware even though my disply says Ver: 2017-04-16-IM NOR

[Desertboy]

Can this controller home a dual ballscrew Y axis independently? I've thought about buying it a few times.

[Clive S]

Can this controller home a dual ballscrew Y axis independently? I've thought about buying it a few times.

Short answer is no

[Desertboy]

Short answer is no

That's a deal breaker, glad I didn't buy one. Otherwise looks a nice bit of kit for the money.

[Sliding Head]

Does either switching between G20/G21 and/or parameter #115 (where it exists) cause the unit display to change from three to four decimal places for Inch use?

I looked through the parameter list in the manuals for both versions and couldn't find anything remotely looking like a scale factor. Earlier entries in the Parameter List imply such things as pulses per MM for distance. If it is assumed that the G code selects Inch or Metric for display purposes my guess would be that changing the Parameters (#34, 35, 36) to 640*25.4 = 16256 or whatever your leadscrew to motor gearing gives you, would solve the problem for Inch users. Perhaps the data entry in the manual should be Pulses per unit of distance travelled, rather than Pulses per MM. I can't remember a CNC system where changing from G20 to G21 did anything other than move a decimal point in tool or work offsets. It did however cause scaling for axis moves.

By implication all this suggests that the DDCSV varieties do not have a switchable Inch Metric system - but it can be set up to work with the right pulse counts for either Inch or Metric, but not both without changing parameters. The loss of Parameter #115 may indicate the system is simpler than expected. Do people still switch between the two systems?

My two penn'orth

[cropwell]

I have an interest in using one of these types of controllers in the future, so I had a look through the documentation using this as an example problem. I get the impression that not all parameters are changeable 'on screen' and that you have to load a parameter file to your computer, edit it and then upload the parameter file to the device. If this is the case then it seems a lot of faff, I would assume that future versions of the firmware might include the facility to edit this parameter directly as well as the much desired twin screw axis homing and squaring. I don't know how much of the world other than USA (and model engineers stuck in the past) operates in imperial measures, but I reckon it could be a poorly implemented afterthought to make some gesture to the non-metrics of the world.

[Boyan Silyavski]

You can change any parameter on screen. But you can have a setup file at the same time, that can just be loaded. So both things work perfectly and cover different scenarios.

[cropwell]

You can change any parameter on screen. But you can have a setup file at the same time, that can just be loaded. So both things work perfectly and cover different scenarios.

So how is parameter #115 dealt with (I am beginning to think the manual is telling lies) ?

[Boyan Silyavski]

So how is parameter #115 dealt with (I am beginning to think the manual is telling lies) ?

Whats this #115? i cant see it in manual and my machine is busy for a couple of hours so i can not stop it now to look for it.

But as i said, you either input it manually or upload a text file. Thats it