Update rough costs section #23
Conversation
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Thanks so much! I'll try to take a look over your PRs in the next few days!
Also, just so you're aware, I'm currently working on a new iteration of the
hardware that eliminates the gears to be mechanically simpler - it's on the
gearless2 branch if you're interested in taking a look. I haven't yet
ordered/tested it, but just figured I'd give you a heads up that a new
design may be ready within a week or two.
…On Fri, May 4, 2018, 7:59 AM qwertyaardvark ***@***.***> wrote:
I am looking to build two split flap units in the coming month (and many
more in the near future) so I figured I'd help fill out this section and
work on documentation in the wiki.
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#23
Commit Summary
- Update rough costs section
File Changes
- *M* README.md
<https://github.com/scottbez1/splitflap/pull/23/files#diff-0> (53)
Patch Links:
- https://github.com/scottbez1/splitflap/pull/23.patch
- https://github.com/scottbez1/splitflap/pull/23.diff
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README.md
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| * ~$2 /unit -- 28byj-48 motor (12V preferred!) Ebay is a good place to find these motors. (see [motor notes](https://github.com/scottbez1/splitflap/wiki/Motor-info) for specific details) | ||
| * ~$10 /10 units -- male-to-male 3-pin servo cable (for sensors) e.g. on [Amazon](https://www.amazon.com/VIMVIP-10pcs-300mm-Extension-Futaba/dp/B00N8OX7VO) | ||
| * ~$18 /unit -- Digikey electrionic component purchases. ~$16/controller and ~$2/sensor board. More detailed breakout of BOM in [Wiki - Order Parts](https://github.com/scottbez1/splitflap/wiki/Order-parts) |
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update to "~$14 /controller"
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Looking forward to hearing from you that the gearless design works well! I also updated the wiki to reflect the electronic parts. What size M5 screw did you use to replace the rod? |
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Upon thinking about the gearless2 design some more, I was looking at how much impact the placement of the motor will have on the spacing between modules. I am hardly one to complain about the design, especially joining so recently, but would replacing the gears with a belt be a better option? |
Yeah, that's my biggest concern with it. It ended up adding just another 5mm or so between letters I think, which hopefully isn't too bad. Here's a rough comparison Current (master): Gearless: I've considered using a belt before, but it seemed like it would add at least several dollars per module, and I wasn't familiar with good suppliers to use for them, but if you know of any good options I'd love to see what's available! |
README.md
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| Pricing from Fastenal | ||
| * $1.04 /unit -- Qty 10 -- M4-12mm button head screw, hex drive, A2-70 stainless steel (MB2530012A20000) | ||
| * $0.61 /unit -- Qty 10 -- M4 hex nut, A2-70 stainless steel (MN2530000A20000) | ||
| * ??? /unit -- Qty 2 -- M5- **##** mm button head screw, hex drive, A2-70 stainless steel (MB25400 **##** A20000) |
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The bolt for the spool is just the same M4 as all the others, so no M5 should be necessary
README.md
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| #### Hardware & Consumables #### | ||
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| Pricing from Fastenal | ||
| * $1.04 /unit -- Qty 10 -- M4-12mm button head screw, hex drive, A2-70 stainless steel (MB2530012A20000) |
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nit: would you mind keeping the ISO7380 reference here? Just want to make sure it's called out specifically since the design can't necessarily accommodate larger head shapes.
removed and converted M5 screws and nuts to M4 screws and nuts, updated qty and from from 10 each to 12 each. Kept ISO7380 reference for M4 screw; required head dimensions for screw to work in design.
changed price of controller components to $14 from $16 and corrected pcb component total from$18 to $16.
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M5 screws and nuts removed, and ISO reference put back in. 👍 |
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I'll look into the belt and pulleys as I get the chance. :) I feel compelled to make the letter gap as small as possible, but 5mm really isn't as bad as I thought as it was going to be. I am impressed at how much less material gearless design uses. My only other thoughts on the motor placement would be to place it behind the spool entirely somehow so that the module could be easily slid in and out of a large frame. But... that's a design thought for further down the road and one that would eat up more material. Maybe I'll have some layout ideas once I have the module physically in front of me... I am a bit of an old fashioned hands-on mechanical engineer. |
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Thanks for the contribution! By the way, I looked at the widths of the current design vs gearless2 again and it's actually just 1.8mm wider at 82.2 vs 80.4 (can look at the |
I am looking to build two split flap units in the coming month (and many more in the near future) so I figured I'd help fill out this section and work on documentation in the wiki.