Servo Driven 4th Axis for CNC Mill

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gasmeter:
Hi all

I also pulled out all the param settings for others for the 355

all the tuning params etc are there.

Peter

gasmeter:
I worked through all the relevant settings

summary

Andrews settings
MP 3 : 2500 - 4th axis rapid

MP 7 : 2000 - Manual feed 4th axis

MP 11 : 1800 - approach speed approaching ref marks 4th axis

MP 15 : 2 - sig eval input x4 x x interpolation

MP 19 : 0 Traverse direction approaching marks ( 0 positive)

MP 23 : axis IV ref pulse inhibit active/inactive
on connector X10
0 - Ref pulse inhibit
2 - Ref pulse inhibit active

A ref mark is traversed every full rotation of the sensor .
If there are multiple pulses the pulse inhibit can be controlled by a cam switch or similar.

MP 27 : 0 Polarity Positive with traverse dir

MP 31 : 0 Integral factor (set to 0 ?)

MP 35 : 1.000 Differential factor set to 0 ?

MP 39 : +0.000 Backlash compensation

MP 43 : +0.000 Linear compensation factor (keep to 0)

MP 50 : +30000.000 software limit switch range +
MP 51 : -30000.000 software limit switch range -

MP 59 : 14 ZYX IV ref mark approach seq

MP 72 : 0 P all axis set to non inhibit

MP 90 : 0 axis designation of 4th axis 0 = A

MP 166 : 500 Feed speed for 4th axis for param 126-156

MP 180 : 2.000 4th axis KV factor value 0.1-10

MP 189 : +0.000 datum for 4th axis position block for M92

MP 256 : 0 allocation of encoder inpit to 4th axis
0- Standard allocation
4- Encoder x4

MP 299 : 0.250 4th axis accel

MP 302 : 9.000 4th axis rapid traverse voltage

Partsmaster 355 option param 158
Notes on setting to enable 4th axis
param 158 needs to be 16

1 = air conditioner
2 = flashing lamp operated with m22 / m23
4 = flashing lamp on when program run is stopped
8 = swarf conveyor
16 = 4th axis present
32 = feedrate effective in toolchange
64 = high speed spindle
128 = override spindle stall
256 = no toolchanger

add up value & enter into param 158

On my Denford Quatromill it already has 128 set for override spindle stall
so its 128 + 16 = 144 to enable 4th axis / 128 disable 4th axis

It appears a 1800 count.. Count is strange as its a sin/cos but then with the basic interpolation of x5 on the TNC355 then a 4 fold in the signal evaluation parame gives the full 36000 with no gearing.

As to enable / disable 4th axis I have yet to test bit it looks like its

either MP72 8 = IV axis inhibited / clear to enable
MP158 +16 enables 4th axis (on denford quatro it would be 128 = No Ivth axis .. 144 Ivth axis enabled)

I will update when I test.

ddmckee54:
"Later Note: for some odd reason the entire 'lost' Beaver Partmaster directory had become a sub-directory off my Ingersoll Rand Drier directory so just needed moving back - but why did that happen"

Andrew:

If you have a tremor like I do, your fingers probably twitched on the mouse as you were scrolling past that directory. I lost my entire Machining Favorites folder for several days, and that's the only way I can figure it could happen. I about had a heart attack the next time I tried to go on-line to one of those Favorites. Like you I finally found the folder as a sub-folder in one of the adjacent Favorites folders.

Don

awemawson:
. . . a tremor . . . Well Don only after a few too many Harvey's Best Bitter or Glen Fiddich's :clap:

gasmeter:
Hi Andrew could I ask a couple of questions

1/ What did you do for pulse inhibit etc ? Did you do it the same way as hazle ? Simple switch arrangement.

2/ Is there a way to tell the machine that the 4th axis isn't present without changing parameters ?

I almost have all the information sorted now .

Peter

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