Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

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piercet
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Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Sun Jul 19, 2015 5:59 pm

Now that the X axis modifcation is nearly complete, I'm officially starting on the Y axis. Partwise this one will be much more simplistic than the X axis, except it is going to require 4 very precise holes in a heated bed mounting plate. I'm waiting on parts for my initial mockup Y axis (unless someone has a spare Taz y axis they want to send me? No? didn't think so) so this one will likely be a couple weeks in progress before I have anything significant for it.

I'm going with the same Openbuilds wheels I used for the X axis, but a pair of 20mm x 40mm rails this time instead of the single 60mm unit.

Here are the initial mounting parts:
Corners.jpg
support.jpg
You will need 4 of the corner pieces, and 6 of the support pieces for the Y end. The support pieces are there to provide additional axial rigidity along the bed travel path.

Aside from the additional holes in the bed plate, this modification will be largely bolt on, and will require no firmware modifications.

My current thought is to make some printable drill guide templates. This is one of those projects that is going to work great if you get the holes right, and not at all if they are off. The other option would be to try and make some sort of intermediary printed part and mount the openrail hardware to that, which would probably work in the short term, but it wouldn't be strong enough in the long run to matter. If anyone has a better idea, please let me know what you think.

As with all of my projects, this is hereby licensed under the GNU-GPL Creative Commons - Attribution license
Attachments
Openrail_y_support_1_0_astl.stl
(124.3 KiB) Downloaded 104 times
Openrail_y_Corner_1_0_a.stl
(176.45 KiB) Downloaded 85 times

nbmoretto
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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by nbmoretto » Wed Jul 22, 2015 5:00 pm

Any pictures of this installed on your machine?

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Wed Jul 22, 2015 5:38 pm

Not yet, I don't even have all the parts in yet. The new rails get here tomorrow, then I need to build a mock up Y axis to make sure everything fits and I get the spacing for the holes that will need to go into the bed mount plate spaced exactly right. It's probably going to be a little while before its all in.

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Wed Jul 22, 2015 10:10 pm

Here is a first look at the mock up. I'm printing a nonfunctional Y axis endplate right now to go with these parts to get the bed position.
IMG_1902.JPG
IMG_1901.JPG
That piece of extrusion represents the existing Y axis extrusion on one side of the TAZ. The real thing is obviously going to be longer than that, but you get the general idea. The mid span supports are designed to provide support against downward and side deflection of the Openrail 20x40mm rail, along with a small amount of anti lifting force as necessary. These will fit around the bed mounts. That should be the only printed parts required for this upgrade aside from the optional drill hole positioning templates for the bed once I get them done

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Thu Jul 30, 2015 12:16 am

Here's the rail mockup. I don't have a spair set of lower Y axis rails, so I made do with 2 shorter mismatched pieces. On the real Y axis the pieces will be further apart proportionally to the length of the rail. Next and final step will be locating and drilling the 4 precision holes in the new X axis plate I have on the way for that very purpose, then installing it on the TAZ. Right now I have about 0.05mm +/- deflection at the center of the existing rods according to my dial gauge. I'm hoping this will remove about half of it, with the X axis piece removing the other half. The picture of the gantry plate is just there to show what kind of hole arrangement will be needed on the bed plate. Eventually there will be 4 wheels, 2 on either side of the bed, with adjustment cams on the right hand side.
IMG_1907.JPG
IMG_1905.JPG
IMG_1904.JPG
IMG_1903.JPG

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Thu Jul 30, 2015 9:51 pm

I finally got the mock up put together well enough to get the measurements I needed to construct the Bed Plate modification. This is basically just a stock Taz 4 style bed plate with 4 additional holes in it. I've also uploaded 2 drill guides. The intent of those parts is that you bolt them down to the bed plate in the existing holes for the existing rod bearings as shown in the picture below. You then use that to either mark, or help drill the required holes. I have no idea if these are going to be a help or a hinderance. The two hole sizes required are 4.975 and 7.2mm. I haven't checked my bit sets to see what drills those actually correspond to, but it should be two standard size bits.
Drill Guideplate.jpg
I also realized that I had the end mounts 4mm too tall for some unknown reason. If you already printed them, you can just lop that bit off. Otherwise the Y corner 1.1 file has the corrections.
Attachments
bedmodification.dwg
(63.61 KiB) Downloaded 108 times
Drill Guideplate Lg hole.stl
(52.62 KiB) Downloaded 119 times
Drill Guideplate Small hole.stl
(50.47 KiB) Downloaded 77 times
Openrail_y_Corner_1_1_a.stl
(177.82 KiB) Downloaded 86 times

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Thu Jul 30, 2015 9:52 pm

DWG file of the bed plate itself
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bedmodification.dwg
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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Sat Aug 15, 2015 4:13 pm

Got the plate drilled and the Y axis mounted. Here is a video of the initial run in operation:


and some pictures!
IMG_1943.JPG
IMG_1942.JPG
IMG_1941.JPG
IMG_1940.JPG
IMG_1939.JPG

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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by piercet » Sat Aug 15, 2015 4:18 pm

And more pictures. The one rail that looks like it is a degree off is, I need to adjust the back plate on the Y axis, I'm going to wait until the print is finished before I do though. SO far everything is working great. The individual layers are getting a much better bond to one another as well, which is an interesting side effect I wasn't expecting.
IMG_1946.JPG
IMG_1945.JPG
IMG_1944.JPG
IMG_1947.JPG
IMG_1948.JPG

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Orias
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Re: Adding an Openbuilds Openrail Y axis to a Taz 3/4/5

Post by Orias » Mon Aug 17, 2015 12:57 pm

Psssst. Got pics of a print?

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