Servo Fouling with fan case

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BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Servo Fouling with fan case

Post by BigE79 » Mon Oct 29, 2018 12:33 am

I'm having issues with calibration switch hitting the fan casing but only when printing. When calibrating it moves down to the correct position and the bed calibration switch works fine. The calibration values are fairly consistent. When the calibration is finished the servo moves the switch back to the correct rest position. It does not foul with anything and it's well out of the way.

The issue with the switch fouling only starts when a print is started. It pulses at about 1Hz moving about 15deg each pulse. The back of the micro-switch lever is what's hitting the extruder motor fan case. I assume the servo is tripping out or the power supply for the servo is current limiting (assumption only). It does this the whole print.

The issue continues once a print is finished but goes away if I power cycle the machine. Initializing the machine, re-calibration or manual filament extrusion does not trigger the issue, only starting a print does.

Aside from the issue explained the print quality is excellent and there are no other issues. I'm worried that the servo will burn out quickly or the FFC cable will wear out or the micro-switch will break if this issue is not addressed. It really seams like a simple software bug where the resting position of the servo is incorrect when printing (assumption only).

I've attached a video of the servo pulsing once the print is finished but the machine is still powered.
VIDEO0049.zip
Servo Fouling issue Video
(1.62 MiB) Downloaded 85 times
Please help, I would like to keep printing but don't want the machine to break!

TiertimeBrook
Posts: 101
Joined: Tue Oct 16, 2018 8:25 am

Re: Servo Fouling with fan case

Post by TiertimeBrook » Mon Oct 29, 2018 3:57 am

Hello,
This is because of the leveling probe assembly not in a right position,You need first cut down the power take down the extrude head( first screw out the screw in the bottom of the extrude head), and then press downwards the whole leveling probe assembly and make its position under the extrude head and the fan then install the extrude head ,the problem could be solved.

Regards

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Mon Oct 29, 2018 4:20 am

Hi,
Do you have a photo or drawing of the correct position of the leveling probe for reference?

TiertimeBrook
Posts: 101
Joined: Tue Oct 16, 2018 8:25 am

Re: Servo Fouling with fan case

Post by TiertimeBrook » Mon Oct 29, 2018 5:01 am

Hello,
You can send the issue to our support email
support@tiertime.com ,The technical colleague will give you detailed guidance there.

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Mon Oct 29, 2018 9:13 am

I removed the head the inspected the bracket but there's simply no way to adjust the bracket position. The bracket is a rigid plastic bracket and has fixed holes, not slotted holes. There is no way to make any adjustments.
I've attached a picture of the servo in the resting position after calibration, it seems fine
ServoRestingPosition.jpg
Servo resting position.
ServoRestingPosition.jpg (1.26 MiB) Viewed 4906 times
. Again the issue on only when printing.

TiertimeBrook
Posts: 101
Joined: Tue Oct 16, 2018 8:25 am

Re: Servo Fouling with fan case

Post by TiertimeBrook » Tue Oct 30, 2018 12:19 am

Could you leave your email address here, And our technical stuff will contact you for some detail guidance.

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Tue Oct 30, 2018 3:03 am

Hi Brook,

How do I know you're actually from TierTime? Your account is as a registered user and not an Administrator or Moderator. Your account is also only a couple of weeks old.
If you are actually from TierTime shouldn't you know my email address from my profile information?

Tiertime-Joseph
Posts: 155
Joined: Mon Aug 27, 2012 3:45 am

Re: Servo Fouling with fan case

Post by Tiertime-Joseph » Tue Oct 30, 2018 11:31 am

Hi BigE,

Sorry for the confusion. Brook is new to the board, and now a moderator.

Cheers

Joseph

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Wed Oct 31, 2018 12:00 am

I have moved the fan bracket to locate the fan higher on the extruder motor and this has fixed the issue. Some photos attached of the new fan position.....
IMAG1883.jpg
Fan Bracket Position
IMAG1883.jpg (794.34 KiB) Viewed 4861 times
IMAG1885.jpg
Fan Installed
IMAG1885.jpg (737.67 KiB) Viewed 4861 times
I might redesign and print the fan bracket to place it on top but still give clearance for the servo and switch.

TiertimeBrook
Posts: 101
Joined: Tue Oct 16, 2018 8:25 am

Re: Servo Fouling with fan case

Post by TiertimeBrook » Wed Oct 31, 2018 12:30 am

Hi BigE,
Yes,the movement of the fan bracket is the way to fix the issue.
Sorry for the confusion,I am new to the forum,So lots of things need to learn.
Wish you understand that.

If you designed new fan bracket,, Welcome to share with us.

Regards
Brook

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Thu Nov 01, 2018 3:06 am

I've designed and tested a new fan bracket. It still allows the fan to be mounted from the top but it sits the fan 3mm higher for the servo clearance at the bottom. Photo below shows the difference in brackets.
Servo Switch clearance at the bottom is about 1.5mm.

Some installed photos also....




I've attached the STL file for the new bracket also. I printed in ABS+ 0.2mm 99% fill. Use the Same fasteners as on the old bracket.
Attachments
Fan Bracket.zip
STL File for new Fan Bracket
(12.61 KiB) Downloaded 80 times

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Thu Nov 01, 2018 3:11 am

Can seem to get photos working in this forum today. I'll try one at a time..
FanBracketCompare.jpg
FanBracketCompare.jpg (176.63 KiB) Viewed 4824 times

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Thu Nov 01, 2018 3:11 am

FanBracket-NoFan.jpg
FanBracket-NoFan.jpg (347.9 KiB) Viewed 4824 times

BigE79
Posts: 43
Joined: Fri Oct 26, 2018 9:18 pm

Re: Servo Fouling with fan case

Post by BigE79 » Thu Nov 01, 2018 3:12 am

FanBracketInstalled.jpg
FanBracketInstalled.jpg (200.48 KiB) Viewed 4824 times

TiertimeBrook
Posts: 101
Joined: Tue Oct 16, 2018 8:25 am

Re: Servo Fouling with fan case

Post by TiertimeBrook » Mon Nov 05, 2018 12:28 am

Hi BigE,

Thanks for your updates and efforts on the mods.
We Will keep focus on the news.

Regards
Brook

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