[DJ Firestorm]

Hi We have a Beaver Toolmaker 3 axis mill with a Heidenhain 155 control. We have had a constant issue with it pausing when changing direction. At first we thought it was an issue with drip feeding, but if we download a program into the actual control it still does it. The machine parameters are virtually all standard for the machine.

It may be that we have a fault on the machine ie something not tuned in properly, if its this has any one any suggestions?

Or it may be that the CAD system Post processor is not quite correct. We are running PTC Wildfire 4 Pro manufacure for milling. and uploading via TNCserver from Heidenhain. I am wondering if there is a tollerance issue somewhere?

Cheers for any suggestions

Andy

[arhctysv]

Do you know how to get into Parameters?
Code# 95148
Change parameter number 53 to a 2 maybe 3
It is approach speed.
Use to have this problem on Bridgeport Interact CNC's

[DJ Firestorm]

Do you know how to get into Parameters?
Code# 95148
Change parameter number 53 to a 2 maybe 3
It is approach speed.
Use to have this problem on Bridgeport Interact CNC's

Just tried that but still the same, currently set at 1, I tried it at 2 then 3 then 5 and then at 10. the more I increased the number the harder it seemed to be on the machine with all axis's clonking, I tried it the other way @ 0.1 then the machine visably slows to each point but then still dwells/pause's for a sort while.

Good thought though.

I have also just tried the tolerence on the CAM system change the decimal from 0.001mm to 0.005mm that is the same on the control but again makes no difference.

[DJ Firestorm]

Just created a simple program and it virtually paused at every intersction

0 BEGIN PGM 12355555 MM
1 BLK FORM 0.1 Z X-3 Y-3 Z-3
2 BLK FORM 0.2 X3 Y3 Z3
3 TOOL DEF 1 L+0,000 R+6,000
4 TOOL CALL 1 Z S2000
5 M13
6 L X-193,585 Y-25,555 Z+50,000 R0 FMAX M
7 L Z+10,000 R0 FMAX M
8 L Z-10,000 R0 F1000 M
9 CC X-189,275 Y-16,530
10 C X-180,250 Y-20,835 DR+ R0 F M
11 L X-163,790 Y+13,645 R0 F M
12 L X-154,480 Y+35,345 R0 F M
13 L Y+51,435 R0 F M
14 CC X-148,480 Y+51,435
15 C X-151,885 Y+56,375 DR- R0 F M
16 L X-148,115 Y+58,975 R0 F M
17 L X-149,500 Y+64,595 R0 F M
18 CC X-143,675 Y+66,035
19 C X-146,115 Y+71,515 DR- R0 F M
20 L X-142,150 Y+73,275 R0 F M
21 L X-119,335 Y+144,005 R0 F M

Check the geometry from the CAD and its the same as what you would input on the box. begining to think its either a messed up parameter or a fault on the machine.

Cheers

Andy

[arhctysv]

Approach speed always worked for me
on the Bridgeports
Here is a list of parameters from Heidenhain
may be something else is there.
Rich

http://content.heidenhain.de/doku/om...b/sa151155.pdf

[DJ Firestorm]

Cheers for that Rich.

Here are the standard parameters from our machine

the ones that are different are

Backlash
MP 36 0.000
MP 37 0.011
MP 38 0.000

Correction factor
MP 40 0.015
MP 41 0.011
MP 42 0.043

Limits
MP46 +3
MP47 -373.9
MP48 0.675
MP49 -445.47


Approach speed
MP53 should be 0.500 is 1.000

Limitation of S overide
MP89 should be 0 is 10

Min voltage for S Analogue Output
MP184 should be 0.083 is 0.125

Standard Data Interface v24
MP223 should be 0P is 1P

Positon window for spindle axis
MP246 should be 0 is 1

Not sure if any of these may/maynot make a difference


Cheers

Andy

[DJ Firestorm]

Although I would still appreciate any ideas and suggestions you have to help solve this problem ourselves, can anyone let me know of any Heidenhain specialists in the Manchester/Derbyshire area.

Cheers

[gridley51]

You could try Machine Support Svs.They are about Crewe somewhere.He knows the Beavers and Heidenhain outside in.
Don`t leave a message with his office girl,she won`t get it right.

[mick.w]

hi
have you tried an M90 at the end of each line. at least i think it is M90 .
if the control has this function it should make an instant move at your intersection points. 155 is an old old system so may not have this function available,

hope this helps

mick w

[minhas1986]

Dear replace M with M90 in every line it is constant counter speed

And be sure that parameter 60 is set to 1 nor 0

[mflux_gamblej]

I'm having this same issue right now where the machine pauses at contour intersections. It kills the finish because the tool chatters when the machine pauses.

Did anyone definatively fix this issue?

I'll check out my machine parameters asap to see if that helps, but It'd be nice to hear if you fixed your issue or not.

Thanks!

[hughesbros]

I have a TNC 2500 control it is basically the same as the tnc 150 and 155. Under user parameters there is a setting that gives the option Normal or Lag you need to set it to Lag=1. If you can't find this setting the machine parameter for the TNC2500 is MP1390 or for TNC155 is MP60 set it to 1. The function for this parameter in the manual is "Speed pre-control".

After changing the setting above you have 2 options
1. Put M90 at the end of all the lines you want constant contouring.
2. Go back to the machine parameters and change the setting for "Constant contouring speed at corners" TNC2500 MP7460 or TNC155 M91. The standard setting on my machine was 2° I've changed it to 20° and all seems ok. You might want to set this back to the default when you are not surface machining.

Another trick if you are drip feeding to the control, use G code and set all the line numbers to N1, there is a limit of about 65000 lines otherwise. The only drawback is if a cutter breaks you don't know what line it was at.

Mark

[adrenaLinas]

hello!

I put M90 in line end for smoother contour finishing, but there is one problem. Low data trasfer speed. I use transfer blockwise and tnc remo server. Speed is set 9600 on controller and tnc server, using FE mode. Today i decided to count what actual speed is and got only 200 bytes per second. (i counted 10'000 bytes in 50 seconds in tnc server). Can anybody tell me what can be done. Such speed is killing me. Surface finish at high speeds is impossible. When i output nc program with powermill max feedrate can be ~250 if surface is too complex.

[mflux_gamblej]

unfortunately 9600 baud is what you get from this vintage of control. Let the program build up as much as possible before running. Another thing you can do is to put in an optional stop like you are going to to a tool change every 2500 lines or so, wait for the buffer to fill, then press cycle start to go again.

you can also tune the contouring speeds - look for my other posts on this. I wouldn't get too crazy with the parameter changes though or you'll lose accuracy.

these old heidenhain controls are not ideal for 3D surfacing or trochoidal paths. You'd understand if you go use a modern machine that the difference is staggering. I don't mean to discourage you though. It can be optimized to 'make the best of whats available'. I posted what I learned on my other posts.. good luck to you

[adrenaLinas]

thanks mflux_gamblej for such quick replay.
Sadly I have no opportunity for now to try modern cnc. I don't wanna play with parameters too. somebody played with them before me and when i started work here, head was trembling when starting to move and stopping. (restored parameters and everything was back to normal).
Does anybody gets 9600bytes/s at all? or it is just theoretical speed? I would never ask about it but 200 bytes per second is way too less than 9600.
Have you tried to count by yourself, what actual data transfer speed you get?

I let to fill full buffer now and counted filling time.
Heidenhain tnc 155b/q
Buffer 67000 bytes;
time to fill 330 seconds (5minutes 30 seconds).
transfer speed = 203 bytes per second.

its about 2% of 9600B/s....

[mflux_gamblej]

seconds bytes bits bits/second (baud) bytes/sec baud setting
390 71834 574672 1473.517949 184.1897436 9600
120 35000 280000 2333.333333 291.6666667 9600
328 73472 587776 1792 224 9600


Sorry the spacing doesn't show up well, but maybe copy/paste to notepad or something. The summary is that I get about 200 ish bytes per second too and it is different with the three test runs

[adrenaLinas]

thanks again. I think i will not invent anything with this. I'll try to modify postprocessor instead. maybe will try to get rid 3rd place after comma and use only 2 line numbers. it would save 3-4 bytes in every line

[mick.w]

hi

do you know how to change your machines and servers baud rates ?

press MOD key and arrow up or down to find baud rate . it will =9600, change this by pressing enter, you should see several choices as you press enter,

select as a start something like 19800 or figure close to this

on your tnc remo server you need to configure this to the same baud as the machine,

If you manage to change these settings give prm transfer another go

best of luck

mick

[stevemarkovick]

I had a similar contouring issue where the transitions weren’t smooth due to control loop settings. After tweaking the acceleration parameters, the path accuracy improved noticeably. It’s also worth checking if your postprocessor introduces unnecessary blocks. In my case, Phonexa’s integration helped streamline some back-end analysis, which made identifying the issue much easier.