Inconsistent Z Axis Homing

TheDude
Posts: 35
Joined: Tue Jul 17, 2018 2:45 am

Inconsistent Z Axis Homing

Postby TheDude » Mon Dec 17, 2018 1:42 am

All,

I believe I'm experiencing some inconsistency with my Z- Axis height after homing during print start. I diligently pre-check and set the nozzle gap with a gauge, and then kick off the print, but the machine seems to either not repeat the gap upon print start. Either too close or too far.

Any insights on how I can check this? Any others having this problem?

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Vicky@Raise3D
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Re: Inconsistent Z Axis Homing

Postby Vicky@Raise3D » Mon Dec 17, 2018 8:10 pm

Whether the checking result of nozzle gap will change with multiple homing measured by feeler gauge?

TheDude
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Joined: Tue Jul 17, 2018 2:45 am

Re: Inconsistent Z Axis Homing

Postby TheDude » Tue Dec 18, 2018 3:43 am

Vicky,

I'm not sure I understand. Are you asking me a question or stating something? Sorry.

Are you saying that indeed checking multiple homing operations in sequence, the nozzle gap will change? Or are you asking me if I noticed the change after checking multiple homing sequences?

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Vicky@Raise3D
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Re: Inconsistent Z Axis Homing

Postby Vicky@Raise3D » Tue Dec 18, 2018 10:16 pm

Sorry for confusion.
I would like to have you check whether the nozzle gap changes after every Z homing.

harrelsontrumpets
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Joined: Wed Dec 19, 2018 1:49 pm

Re: Inconsistent Z Axis Homing

Postby harrelsontrumpets » Wed Dec 19, 2018 1:55 pm

My Pro2Plus does the same thing. It does not home Z to the same place every time. I'm a machinist and you will have to live with me using inches in my posts despite all the people complaining about the mandatory use of mm here. You people are kind of strange!

Yes, using feeler gages, the Z height is different every other time I home the machine.

It appears the light interrupt sensor is not working properly. It is clean, just inaccurate.
One time it will home at .010, then .008, then .013 and so on.

Jason

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Vicky@Raise3D
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Re: Inconsistent Z Axis Homing

Postby Vicky@Raise3D » Wed Dec 19, 2018 10:48 pm

From 0.008 Inch to 0.013 Inch? Which means it changes from 0.33mm to 0.2mm? Have you see any wiggle on your Z adjusting screw? Or any abnormal will cause the screw changes height easily?

harrelsontrumpets
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Re: Inconsistent Z Axis Homing

Postby harrelsontrumpets » Thu Dec 27, 2018 2:17 pm

Vicky@Raise3D wrote:From 0.008 Inch to 0.013 Inch? Which means it changes from 0.33mm to 0.2mm? Have you see any wiggle on your Z adjusting screw? Or any abnormal will cause the screw changes height easily?


Very good, now you can convert from inches to mm!

No, there is no play in the Z screw. Could you imagine if I were so dumb to not notice something so simple? It is clearly an issue with the sensor or the board as everything is tight.

zemlin
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Joined: Sat Oct 21, 2017 2:02 pm

Re: Inconsistent Z Axis Homing

Postby zemlin » Thu Dec 27, 2018 4:01 pm

Are you setting the gap with the bed hot? There seems to be enough thermal expansion in the system that I find it best to set the gap with the bed at print temp and the nozzle close to temp.

TheDude
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Re: Inconsistent Z Axis Homing

Postby TheDude » Fri Jan 04, 2019 8:00 pm

Zemlin,

That's a good point, but does introduce the need to home for every temp range you choose to use. Eeek!

Harrelsontrumpets,

Glad I'm not the only one seeing this. I expected more robust consistency, at least something a little closer each time. I agree the light gap sensor may not be accurate enough or has error built into how it operates.

zemlin
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Re: Inconsistent Z Axis Homing

Postby zemlin » Sun Jan 06, 2019 2:08 pm

TheDude wrote:Zemlin,
That's a good point, but does introduce the need to home for every temp range you choose to use. Eeek!

Setting up for a new part usually involves a material change, often a bed change, maybe a nozzle change - homing the bed is just part of the setup and no big deal to me.

Shelton
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Joined: Thu Jul 12, 2018 8:34 pm

Re: Inconsistent Z Axis Homing

Postby Shelton » Mon Jan 07, 2019 11:26 am

From 60 to 100 C is almost 0.2 mm difference...


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