Easy TAZ Mini Hardware Development

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jebba
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Easy TAZ Mini Hardware Development

Post by jebba » Fri Apr 04, 2014 11:11 pm

A dir of code and photos of the new Easy TAZ mini frame:

http://devel.lulzbot.com/Easy_TAZ_Mini/frame_concept/

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piercet
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Re: Easy TAZ Mini

Post by piercet » Fri Apr 04, 2014 11:55 pm

I'm going to see if I can fit a light bracket to the upper portion of the frame there. Will post the design files and concept pictures here when I have something working.

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Re: Easy TAZ Mini

Post by piercet » Sat Apr 05, 2014 1:14 am

Here's what I'm thinking of for the light subsystem to avoid the need to add additional holes to those sheet metal trays.
taz_mini_corner_bracket_lightmount_LR_2_0_a.png
Modification to the left and right upper corner bracket. Lightbar endcap sockets into the arm, wires for the light go out the hole and can be ran down the corner of the frame to power source and or switch. I'm assuming those 6.4MM holes in the corner brackets will be recieving heat set inserts so leaving room for nuts or nut drivers shouldn't be a concern.

End cap would be something along this line. I'm thinking possibly a different, slightly stiffer design than the existing lightbar to try and span that whole gap without needing a center reinforcement. That will use a bit more plastic, but won't require adding a hole to the frame. This is the existing long variant of the lightbar endcap which will fit those corner brackets as is.
endcap.png
endcap3.png
endcap3.png (7.25 KiB) Viewed 5075 times
I know the existing endcap pieces are 20mm x 20mm x 20mm. How far apart are they on that top sheet? I'm guessing a 350-400mm span for a ligthbar in between them?

The existing lightbar fits this style LED strip light. http://www.ebay.com/itm/Waterproof-Supe ... 33831451c4 Since it seemed to be cheaply available in quantity.

Anyways, I'll keep toying with it. The files uploaded here are hereby officially licensed under the Creative Commons Attribution license, unless that won't let you guys use them for whatever reason in which case i'll change it to whatever it needs to be.
Attachments
taz_mini_corner_bracket_lightmount_LR_2_0_a.dwg
(57.69 KiB) Downloaded 99 times
taz_mini_corner_bracket_lightmount_LR_2_0_a.stl
(235.43 KiB) Downloaded 82 times
taz_mini_corner_bracket_lightmount_LR_2_0_a.stp
(93.14 KiB) Downloaded 103 times

jebba
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Re: Easy TAZ Mini

Post by jebba » Sat Apr 05, 2014 10:24 pm

Cool, thanks, we'll check these out. Our cluster needs better lighting, now that it is up on stage! ;)

-Jeff

bam
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Re: Easy TAZ Mini

Post by bam » Mon Apr 07, 2014 8:26 am

piercet wrote: I know the existing endcap pieces are 20mm x 20mm x 20mm. How far apart are they on that top sheet? I'm guessing a 350-400mm span for a ligthbar in between them?
Looks awesome! As it stands now, there's 358mm to work with on the inside of the TAZ Mini. a 300mm bar would probably work well and give us ~29mm to work with on either corner for mounting.

Cheers
-Brent

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piercet
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Re: Easy TAZ Mini

Post by piercet » Mon Apr 07, 2014 9:07 am

Ok cool. I'll work up a lightbar tonight when I get home. Will probably shoot for 295mm to make sure it fits on a full Taz bed without issue. It's basically going to be the existing lightbar, somewhat thicker, with the new end relief section for the heat shrink tubing over the soldier point so everything fits nicely into the endcaps.

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Re: Easy TAZ Mini

Post by piercet » Mon Apr 07, 2014 10:25 pm

Alright, bunches of files here. I'll start with the images. The new endcap and the new lightbar are designed to accomodate the wire leads and the heat shrink tubing at the end of the LED light strip. The fit may be too tight at this point, will have to see how it prints. The endcap that will recieve the wires gets the hole in the center of the mounting tab drilled out by a M4 drill bit before inserting over the wire and onto the LED strip.
Lightbar_1_0_a.png
endcap2_1.png
endcap2.png
Attachments
Lightbar_1_0_a.stl
(38.95 KiB) Downloaded 122 times
endcap_taz_mini_2_0_a_RL.stp
(63.24 KiB) Downloaded 82 times
endcap_taz_mini_2_0_a_RL.stl
(86.61 KiB) Downloaded 107 times

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piercet
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Re: Easy TAZ Mini

Post by piercet » Mon Apr 07, 2014 10:39 pm

Here's the rest of them.

Assembly sequence:
1. Print 1 lightbar, 2 endcaps and 2 corner brackets. Endcaps should be printed with the oval opening pointing towards the bed for best results.
2. Cut 295mm length of LED strip light (may need to adjust that based on where the cut lines are)
3. Soldier a positive and a negative lead wire (5" long?) to one side of the LED strip.
4. Test for continuity with bare wires, then heat shrink tubing at the end of the LED strip to cover the soldier
5. Adhere LED strip to lightbar in the provided recess. Allow adequate time for adhesive to set before handling
5a. Optional - Use clear heat shrink tubing or clear tape at several points along lightbar to secure LED strip against heat detachment if adhesive is not strong enough. This has been a hit and miss issue for me with some LED strips.
6. Drill out one of the two endcaps at the center of the mounting tab with a m4 drill bit.
7. Slide the endcap over the wires and onto the lightbar. Trim for clearance as needed. Secure first endcap with adhesive if required.
8. Slide second endcap over other end of light bar assembly
9. Feed wires through one of the two corner bracket light bar mount holes.
10. Sleeve, heat shrink, and add end connectors to LED wire header at this time
11. Place assembled lightbar in position between 2 corner brackets and screw into upper Taz mini frame plate. Adjust width of lightbar using second Endcap until unit is in position and able to move, but snug enough to maintain angle.
12. Secure second endcap with adhesive. Once ideal length is identified, process may be completed outside the TAZ mini frame prior to assembly.

So, I think that should be pretty close. Basically from the LED wire header, go to a light switch, then to a 12V power source (whatever the cooling fan for the controller is running off of should work) If the lengths need adjustment I can move things around. You should have the design files in a format you can work with hopefully there. If not, I can try exporting other ones.

All these files and the ones in the preceding post are again licensed under the Creative Commons - Attribution license if that will work.

That lightbar and endcap set should also work with the Clip in Taz style endcap brackets. The main concern I have is droop over the span. I think it will be thick enough now, but we'll see.

A Plexiglass lightbar might also work with those endcaps and brackets and might provide a more structurally rigid backing.
Attachments
Lightbar_1_0_a.dwg
(41.21 KiB) Downloaded 96 times
endcap_taz_mini_2_0_a_RL.dwg
(47.21 KiB) Downloaded 104 times
Lightbar_1_0_a.stp
(40.3 KiB) Downloaded 96 times

jebba
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Re: Easy TAZ Mini Hardware Development

Post by jebba » Thu May 01, 2014 9:00 pm

I've started a thread over here about Easy TAZ Mini Software Development:

http://forum.lulzbot.com/viewtopic.php?f=18&t=863

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Re: Easy TAZ Mini Hardware Development

Post by jebba » Wed May 14, 2014 8:58 pm

The system can power on, connect, heat up, auto bed level, and print without any intervention. :)

We have a nice bed leveling system going on the Easy TAZ Mini now. It still has a ways to go, but we're simply going to have the nozzle zero out on metal plates in the corner, as an endstop. It is accurate, when the nozzle is clean... We're going to add a nozzle cleaner of some sort. A wire brush works ok for testing.

It is controlled by an Olimex A20 Dual ARM 1GHz, 1 gig RAM, 16 gig miniSD, with 7" touchscreen running Debian armhf. We're going to start uploading more of the software here:
http://devel.lulzbot.com/Easy_TAZ_Mini/ ... e/current/

At present, we are using the "official" Olimex A20 Debian image, which is nice, but fat. We have built our own bootloader, kernel, and sd image, but don't have that all working yet. It is mostly standard debian tools. Uboot, an embedded bootloader, is used instead of grub. The final version will have our own versions of this built up, but for now we're just using their image.

We're looking at a E3D v6 or a RepRapDiscount custom Hex nozzle, for a low cost all metal hot end.

The development version names are Azalea (present, 5 being built), Begonia (next stage, 15 to be built), then Camillia (final prototype stage, 30 to be built).

For Begonia, we are going to use the PCDuino v3: https://www.sparkfun.com/products/12856

For Camillia we're going to evaluate a custom "core" board that the PCDuino/LinkSprite folks are doing. It is based on the Allwinner A20 CPU (same as Azalea & Begonia). When available, the 8 core A80 should be a drop in replacement (as the single core A10 is).

The R&D, production, and marketing schedules are here:

http://devel.lulzbot.com/Easy_TAZ_Mini/ ... M/?C=M;O=D

-Jeff

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