Z Wobble, or is it? February 12, 2020 02:26PM |
Registered: 11 years ago Posts: 1,277 |
Re: Z Wobble, or is it? February 12, 2020 05:35PM |
Registered: 11 years ago Posts: 5,780 |
Re: Z Wobble, or is it? February 12, 2020 07:03PM |
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Re: Z Wobble, or is it? February 12, 2020 08:57PM |
Registered: 6 years ago Posts: 61 |
Re: Z Wobble, or is it? February 12, 2020 09:19PM |
Registered: 11 years ago Posts: 1,277 |
Re: Z Wobble, or is it? February 12, 2020 09:37PM |
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Re: Z Wobble, or is it? February 12, 2020 09:44PM |
Registered: 11 years ago Posts: 1,277 |
Re: Z Wobble, or is it? February 12, 2020 09:59PM |
Registered: 11 years ago Posts: 1,277 |
Re: Z Wobble, or is it? February 12, 2020 10:09PM |
Registered: 6 years ago Posts: 61 |
Re: Z Wobble, or is it? February 12, 2020 10:10PM |
Registered: 11 years ago Posts: 1,277 |
I am using these [cdn3.volusion.com] Yeah, I realized what TDD was finally.Quote
mcdanlj
TDD == the_digital_dentist
The pillow blocks I'm talking about have set screws (grub screws) to hold the lead screw, and the lead screw would never touch the riser. I have no recollection where I bought them, but [www.amazon.com] is an example of the kind of pillow block I'm talking about. Wouldn't damage a riser block on which it was mounted in any way.
I put pillow blocks like that at the top of the lead screw as well; theoretically overconstrained, but the 500mm T8 would whip when the bed was near the bottom so in practice it helped. YMMV.
Re: Z Wobble, or is it? February 13, 2020 07:42AM |
Registered: 8 years ago Posts: 413 |
Re: Z Wobble, or is it? February 13, 2020 09:27AM |
Registered: 11 years ago Posts: 1,277 |
Nope, it is a repeating pattern typical of Z Banding and there is just nothing I can do, short of having a CNC machine at my disposal which I don't have, to fix this. Just something I will have to live with and sand off if needed.Quote
MCcarman
Looks like a shrinkage effect to me.
If it was it would be affected by temperature variation - you think nothing has changed there. Note that cooling fan influence may be more relevant to bang - bang so changing the cooling fan settings may have an influence.
Layer print time. It is on the small cube but may not be the same on larger objects. Hmmm - cooling fan on for small layers ?
Infill effects - if you had different infill layers.
Can't really see the sides of the cone so can't judge it. If it is a layer size effect then it would be more pronounced near the cone top.
Re: Z Wobble, or is it? February 13, 2020 11:23AM |
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Re: Z Wobble, or is it? February 13, 2020 12:39PM |
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Re: Z Wobble, or is it? February 13, 2020 05:42PM |
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Re: Z Wobble, or is it? February 13, 2020 06:50PM |
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Re: Z Wobble, or is it? February 14, 2020 07:39AM |
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Re: Z Wobble, or is it? February 14, 2020 08:04AM |
Registered: 6 years ago Posts: 61 |
* The PID frequency will be the same as the extruder PWM. * If PID_dT is the default, and correct for the hardware/configuration, that means 7.689Hz,
Re: Z Wobble, or is it? February 14, 2020 12:27PM |
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Re: Z Wobble, or is it? February 14, 2020 01:01PM |
Registered: 5 years ago Posts: 265 |
Quote
It's been years since I used Marlin, but IRIC there are variables somewhere that set the PWM frequencies for the bed and hot-end independently, and they default to hundreds or thousands of Hz.
Re: Z Wobble, or is it? February 14, 2020 01:05PM |
Registered: 11 years ago Posts: 1,277 |
Yes, BUT is that 7hz for the LPC 1768 as well? Something tells me it isn't due to it running at 100mhz vs 16mhz.Quote
MMcLure
Quote
It's been years since I used Marlin, but IRIC there are variables somewhere that set the PWM frequencies for the bed and hot-end independently, and they default to hundreds or thousands of Hz.
At least in recent Marlin this isn't true - the default bed and hot end PWM frequency is around 7Hz, unless you change the setting of SOFT_PWM_SCALE.
Re: Z Wobble, or is it? February 14, 2020 11:33PM |
Registered: 6 years ago Posts: 61 |
Quote
Dark Alchemist
Yes, BUT is that 7hz for the LPC 1768 as well? Something tells me it isn't due to it running at 100mhz vs 16mhz.
Re: Z Wobble, or is it? February 15, 2020 01:36AM |
Registered: 11 years ago Posts: 1,277 |
Re: Z Wobble, or is it? February 18, 2020 01:17PM |
Registered: 5 years ago Posts: 265 |
Quote
Dark Alchemist
edit: Oh, the red led never flickers it is full on or full off and it doesn't flicker even on a smart phone camera.
Re: Z Wobble, or is it? February 18, 2020 05:51PM |
Registered: 11 years ago Posts: 1,277 |