Jerky Movement on Interact 1 MK2

[palikalsi]

Hi All,

When machining a part, my machine pauses for ~1 second after each linear movement and then starts again. Does anyone know what the cause is and if it could be corrected? I have attached a picture showing two cases, first where the movement is smooth and second where the machine pauses between linear paths.

I have a TNC 2500 on the machine.

Pali

[bigbaz]

Put a small radius on all intersecting lines and machine should go all the way round without pausing, dont know why but it works for me.

[palikalsi]

bigbaz,

I know that adding radius at the end of each linear path would make the operation smooth but I am hoping that there is a way to achieve continues motion with straight linear paths. I machine many parts with pockets that are entirely linear paths at multiple DOC so the pause time adds up significantly.

Pali

[bigbaz]

the radius you use can be so small that it cannot be seen on the part but will give you what you want.

[gus]

first, if you are using 1 axis moves[X 3.00 F100 etc] rather than interpolations[L x3.00 etc] don't.

If that isn't it, is there a parameter for positive stop at corners ?

Also, slow accel parameters can make it appear to stop, when it actually isn't it is just ramping for a long time.

[palikalsi]

Agreed. But...

I use CAM to generate the code as these are complex parts. It would not be efficient to add curves to programs that contain 2000+ lines. Just imagine a rectangle pocket that has 10 tool steps at 5 different DOCs. This means that I would have to add 10 x 4 x 5 = 200 curves. Even if I was able to add the radius at each of these locations, I would end up consuming so much more memory for the program.

I can understand if there is no way to achieve continuous motion for linear movements with the setup on my machine but I don't know if this is the case. I guess my question should be if it is possible to eliminate the pause for linear movements via parameters or tunning?

I appreciate your help bigbaz.

Regards,

Pali

[palikalsi]

Gus,

I just noticed your post after replying to bigbaz's comments. I am not using single axis movements, see code below.

Smooth Movements with the following code:
14 L Y-1.3100
15 CC X+1.9710 Y-1.3100
16 C X+1.9710 Y-1.6325 DR-
17 L X+.1250
18 CC X+.1250 Y-1.3100
19 C X-0.1975 Y-1.3100 DR-
20 L Y-0.1250
21 CC X+.1250 Y-0.1250
22 C X+.1250 Y+.1975 DR-
23 L X+1.9710
24 CC X+1.9710 Y+.2475

Jerky Movements with the following code:
9 L X+.9007 F+220
10 L Y-0.8332
11 L X+1.1953
12 L Y-0.6019
13 L Y-0.4144
14 L X+.7132 Y-0.4143
15 L Y-1.0207
16 L X+1.3828
17 L Y-0.4145
18 L X+1.1953 Y-0.4144
19 L Z+.0500
20 L X+3.6953 Y-0.6019

I will check the parameters descriptions to see if there are options for positive stop and slow accel.

Regards,
Pali

[palikalsi]

Found a parameter for "Constant path speed at corners" which can be set between 0 - 179.99. My machine is set to 1.

Does anyone know what exactly this parameter controls?

Pali

[gus]

set it to 90 and see if it helps. careful with rapids, you may get gross positioning errors as it tries to remain constant at a rapid feed. Otherwise it won't give you any trouble.

accel parameters are in MM/min IIRC


also you don't need all that cc bs, RND will do the trick

[palikalsi]

gus,

The acceleration for all 3 axis is set to .2 m/s2. It can be set from .001 to 3.0 m/s2.

Do you think this is too slow?

Regards,

Pali

[gus]

It is not horrible, could be faster, my retroed machine runs between 2.3 -2.5