Spindle-Pitch

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12 Aug 2017 11:06 #97361 by Tchefter
Tchefter created the topic: Spindle-Pitch
Hi @All, I need to change the spindle pitch in my machine and do not want to do this via the STEPCONF Wizard since otherwise all my adjustments are gone. Can someone write me how I can change this manually? (I think this must be in mymachine.ini)
(Google-Translation :) )

Regards Fritz
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12 Aug 2017 11:14 #97362 by tecno
tecno replied the topic: Spindle-Pitch
Als eine gute ma├čnahme

Always include your .ini and .hal files so you can get easier help.
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12 Aug 2017 11:59 #97366 by Tchefter
Tchefter replied the topic: Spindle-Pitch
Hi Tecno, thanks for the Info :)

here they are
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15 Aug 2017 13:25 #97508 by andypugh
andypugh replied the topic: Spindle-Pitch

Tchefter wrote: Hi @All, I need to change the spindle pitch in my machine
...
(Google-Translation)


I am afraid that Google has made a bad job of the translation, as it is unclear what you mean by "spindle pitch". What was the phrase in German(?)
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16 Aug 2017 03:47 #97544 by Tchefter
Tchefter replied the topic: Spindle-Pitch
Hi Andy, thanks for your reply.
i mean the LeadScrew in German: Trapezgewindespindel.
I have a TR12x3 and mean that this is only 12x2.9 or 12x2.8.
When I measure with the dial gauge, so 3mm, then I am at 2.9mm.
So would like to try a few things, but would not want to destroy my configuration.
But I could also configure a new machine to test, which should have the same effect.
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16 Aug 2017 05:34 #97546 by rodw
rodw replied the topic: Spindle-Pitch
Assuming it is the Z axis you need to change. Open up your .ini file and find this block

[AXIS_2]
TYPE = LINEAR
HOME = 0.0
MAX_VELOCITY = 23.75
MAX_ACCELERATION = 100.0
STEPGEN_MAXACCEL = 125.0
#BACKLASH = 0.0400
SCALE = 533.333333333
FERROR = 1
MIN_FERROR = .25
MIN_LIMIT = -100.0
MAX_LIMIT = 100.0
HOME_OFFSET = 0.0
HOME_SEARCH_VEL = 0
HOME_LATCH_VEL = 0
HOME_SEQUENCE = 0

Then change this line which is the number of steps per mm. eg. the number of stepper pulses to move your axis by 1.0mm. You must allow for any gearing and microstepping
SCALE = 533.333333333
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16 Aug 2017 10:31 - 16 Aug 2017 10:31 #97560 by andypugh
andypugh replied the topic: Spindle-Pitch
It is very unlikely that your 3mm leadscrew is 2.9mm. It is more likely that you are losing steps, or have backlash, or some other mechanical issue.

I could understand 3.175mm pitch, or 2.54, but 2.9 seems very unlikely.
Last Edit: 16 Aug 2017 10:31 by andypugh.
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16 Aug 2017 18:26 - 16 Aug 2017 18:48 #97591 by Tchefter
Tchefter replied the topic: Spindle-Pitch
Thank you rodw and andy for reply,
well the trapezoid thread spindle is not as precise as a ball screw, so i think der must be an error.
A few weeks ago a shaft coupling is broken, now i changed all couplings from cheap to a "little higer prized" one.
That makes a lot of positiv different to the machine, it runs smoother, anyway...
I got also a " Antibacklashnut " (poormans solution = Feather an and a second Nut)


The topic of lossing steps I've already thought, only the problem is how do I notice this?
Must i hear or see it?

For Example:

When I make a wooden box with finger tenons, the tenons are mostly 2/10 larger and the counterpart 2/10 smaller.
For a TR Leadscrew i think tjhis is not bad

I hope it is not too confused for you :)

regards Fritz
Last Edit: 16 Aug 2017 18:48 by Tchefter.
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