Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Want to use the Open Source Hardware documentation to make your LulzBot 3D Printer do even more? Start here!
Post Reply
User avatar
piercet
Posts: 4022
Joined: Sun Aug 25, 2013 1:37 am
Location: Battleground, WA
Contact:

Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by piercet » Mon Oct 16, 2017 12:53 am

Now that I have a Taz Y axis belt tensioner (https://www.thingiverse.com/thing:1656341) it occurs to me that the amount of strain on the main shaft, coupled with potential deflection from the anti vibration damper, could lead to a shaft breakage at some point. it also occurs to me that there is plenty of room above the motor mount to put something there to take care of that problem. So, here it is. Using a 14mm dia x 5mm thick x 5mm shaft 605ZZ bearing, I've created essentially a support "hat" that fits over the motor mount. This will fit stock Taz's of all types including the 6 with the stock mount. it will require slightly linger M3 bolts.

I also decided to tinker with the Motor mount, which has historically been one of the least tinkered with pieces of the Taz, mainly because it works really well. I added some plastic around the middle hole to strengthen it, narrowed the M3 bolt holes for tighter allignment to center, reinforced the side plates, removed 1mm worth of the mount surface itself (the reinforced smaller hole should have about the same mass, and this assumes you are bolting an anti vibration mount in line which will add back some flex strength there too) added some fillets, and added a lower mount point on either side of the side plates to fit a future cable cover thing that doesn't yet exist. The new mount takes 2 additional M3 heat set inserts in addition to the standard M2 ones for the limit switch. The motor mount will NOT work on a Taz 6 (1-5 only). The bearing support cap still will though.
IMG_2713.JPG
IMG_2714.JPG
IMG_2715.JPG
IMG_2716.JPG
Attachments
Taz_Y_Motor_Mount_Cap_1_0_a.stl
(310.82 KiB) Downloaded 60 times
Taz_Y_Motor_Mount_2_4_alternate_1_0-a.stl
(309.65 KiB) Downloaded 67 times


User avatar
piercet
Posts: 4022
Joined: Sun Aug 25, 2013 1:37 am
Location: Battleground, WA
Contact:

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by piercet » Mon Oct 16, 2017 1:04 am

piercet wrote:
Mon Oct 16, 2017 12:53 am
Now that I have a Taz Y axis belt tensioner (https://www.thingiverse.com/thing:1656341) it occurs to me that the amount of strain on the main shaft, coupled with potential deflection from the anti vibration damper, could lead to a shaft breakage at some point. it also occurs to me that there is plenty of room above the motor mount to put something there to take care of that problem. So, here it is. Using a 14mm dia x 5mm thick x 5mm shaft 605ZZ bearing, I've created essentially a support "hat" that fits over the motor mount. This will fit stock Taz's of all types including the 6 with the stock mount. it will require slightly linger M3 bolts.

I also decided to tinker with the Motor mount, which has historically been one of the least tinkered with pieces of the Taz, mainly because it works really well. I added some plastic around the middle hole to strengthen it, narrowed the M3 bolt holes for tighter allignment to center, reinforced the side plates, removed 1mm worth of the mount surface itself (the reinforced smaller hole should have about the same mass, and this assumes you are bolting an anti vibration mount in line which will add back some flex strength there too) added some fillets, and added a lower mount point on either side of the side plates to fit a future cable cover thing that doesn't yet exist. The new mount takes 2 additional M3 heat set inserts in addition to the standard M2 ones for the limit switch. The motor mount will NOT work on a Taz 6 (1-5 only). The bearing support cap still will though.

IMG_2713.JPG
IMG_2714.JPG
IMG_2715.JPG
IMG_2716.JPG
Project repository:
https://www.thingiverse.com/thing:2588359

gapdev
Posts: 117
Joined: Sat Jun 21, 2014 1:55 pm
Location: Dana Point, CA

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by gapdev » Tue Oct 17, 2017 6:53 am

How many mm of the shaft should be sticking out from the Pulley?

User avatar
piercet
Posts: 4022
Joined: Sun Aug 25, 2013 1:37 am
Location: Battleground, WA
Contact:

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by piercet » Tue Oct 17, 2017 8:51 am

For this to be usable, a minimum of 2mm, ideally 4mm or more. Anything less than 2 and the bearing isn't really going to be doing much.

kmanley57
Posts: 1110
Joined: Sun Feb 01, 2015 3:53 pm

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by kmanley57 » Tue Oct 17, 2017 10:48 am

The bearing at the top kind of defeats the purpose of the damper on the motor to not transfer motor noise. YMMV.
I will express my CRAZY ideas at any time! So you have been warned. None of my opinions are Lulzbots and can be wrong at any second.

User avatar
piercet
Posts: 4022
Joined: Sun Aug 25, 2013 1:37 am
Location: Battleground, WA
Contact:

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by piercet » Tue Oct 17, 2017 10:54 am

kmanley57 wrote:
Tue Oct 17, 2017 10:48 am
The bearing at the top kind of defeats the purpose of the damper on the motor to not transfer motor noise. YMMV.
The bearing constrains motion in the XY direction, but still allows the damper to work in the Z axis just fine. It still seems to reduce noice quite well, I notice no difference in sound with the hat installed or removed, with the bearing in or not in. You can always install a second damper between the hat and mount and get a longer shaft motor if you are worried about it, but it doesn't seem to be an issue because the damper can still absorb vibrations by moving in Z, and more importantly the rubber material is still in between the motor body and the motor mount,m which is where 85% of the noise transfer takes place.

ruffle
Posts: 9
Joined: Sat Apr 07, 2018 8:03 am

Re: Taz 1-6 Y motor upper bearing shaft protector anti break thingy of doom

Post by ruffle » Tue Jun 26, 2018 12:47 am

If you're going to fit this without the damper to a TAZ6 you'll need a 6mm spacer and 4 M3x20 socket head screws.
The attachment TopHat Spacer.png is no longer available
Attachments
TopHat Spacer.png

Post Reply