In the middle of the night on July 31st, the motherboard in my workstation burst into flames. Things just sorta went downhill from there… Read more…
Happy New Year, everyone!
Yeah, I stopped updating… Some family trouble and the shuffling around of people and things put the kibosh on my workspaces for a while. Everything is cluttered to high hell as the apartment is choked with other peoples’ things. (Not that it was all that orderly before…)
Over the holidays I managed to pick up something cool; a real silkscreening press from Ryonet, thanks to their reduced holiday pricing. I also picked up a dozen blank shirts in various colors from Amazon when I found a seller that had good Fruit of the Loom t-shirts in a roomy 4XL for $5.90 a piece. (Amazon Prime, even!) Unfortunately, they’ve since upped their prices.
I’ve really been faced with sort of a neverending cavalcade of clustastrophuckery (Catastrophe+Clusterfuck+Fuckery) lately, but I try not to let it get the best of me, and slowly but surely I acquire more of the tools I need to do the things I’m trying to do and hopefully I’ll manage to do them before things get too far out of whack.
Anyway, here’s what I hope to be posting in the coming days, weeks, and months:
- Review the silkscreening press, including results.
- Disclosures regarding my heretofore fairly hush-hush drone projects.
- Extremely past-due update on the state of my IndieGoGo fundraiser.
Spent most of the week battling an utterly horrendous chest cold complete with coughing up blood and everything, it was grand. Still riding the tail-end of it now, with lumps of disgusting goo rattling around in the ol’ pipes, but mostly it’s cleared up.
Couldn’t think of any links or anything to add…maybe later.
So, as some of you know, I’ve had no end to trouble producing printed circuit boards (PCBs); there’s always some damn thing that isn’t quite right… Toner transfer is always a crapshoot, quality-wise. And photo-resist is iffy because my laser printer can print good high-density positives, but not negatives, and my CraftRobo can’t cut rubylith fine enough for the kind of PCBs I’m making…
I’m left with two options; Screen-printing resist to the board. (Since burning screens is a positive image process) Or! Using lithographic film in an emulsion-to-emulsion contact exposure with my laser printer transparencies to yield perfect high-contrast negative films to expose the dry film laminated photo-resist on the PCBs with. (I can also use lithographic ‘duplicating film’ to turn so-so positive transparencies into film positives with perfect contrast.)
Right now I’m just waiting on money for supplies. Like a hundred bucks in chemicals, film, and darkroom stuff.
In the meantime, here’s some YouTube links!
- Direct screen-printed etch resist method. Though these circuit board designs look like they’re from the 1970’s, the process is more than valid. I’d probably go with a ~300 mesh screen though.
- A company called EuroCircuits demonstrating 4+ layer PCB fabrication. This involves dry film laminated resist, and film negatives that are exposed with a laser. Pretty nifty.
A couple years ago I bought a bunch of cheap Chinese digital calipers with the notion of using them to build my own DRO (Digital Readout) for a mill or lathe, or getting one from ShumaTech which now seems quite defunct. A couple weeks ago I stumbled upon a newer project using an Android device as a DRO, with a simple Arduino hardware interface to some magnetic scales. The developer has since added support for the Texas Instruments MSP430 Launchpad board, and is in the process of adding support for the cheap Chinese scales and calipers. I’ll do a full write-up when I build the system. (I’ll be installing it on the lathe, since the mill will be converted to CNC in the near future.)
He was supposed to release an updated version of the firmware that supports the Chinese calipers the weekend this was originally posted, but it’s been two weeks now, and nothing. So I think I’m going to have to get back to writing my firmware now that I have my sample voltage shifter chips from TI.
I fell a bit behind; I had these posts partially prepared but never posted. I’m going to try and add at least a couple links and pictures later.
So I made an order from Shars Tools. Shars is where I’ve gotten the majority of the tooling and instruments for my machine shop. It’s basically the Made-in-China-dot-com of the machine tool world, and judging from the AOL and gmail mail addresses, I swear it’s run out of somebody’s house, and they don’t actually have any inventory, it just comes direct from China and they send it off to customers…it really wouldn’t surprise me in the least. But their prices are hard to beat, they’ve got one of the best selections, and their customer service is good and very responsive, especially considering it really does seem to be run by like ONE PERSON.
This time I picked up some handy bits and bobs, for instance, a set of telescoping gages, and a direct-reading ‘mechanical digital’ micrometer accurate to 0.0001″. Very good tools for inspection.
I picked up some new inserts for the indexable tools for my lathe; since I can’t run it fast enough to reach the optimal cutting speeds for carbide inserts on aluminium I’d been meaning to get some aluminium-specific inserts…which are sort of hard to find for some reason. I also picked up a matching indexable boring bar. I wanted to get a pair of internal and external indexable threading tools with special thread-forming inserts, but they were like $30 each. Need to do that though if I’m going to really do any serious fabrication on the lathe. I also had my eye on this great grooving and profiling tool. Profiling will be a big deal if I ever convert the lathe for CNC.
Also picked up an indexable dovetail mill for the milling machine. I figured it didn’t cost that much more than the non-indexable version, so screw it. This way, any time it gets dull, I can just replace the cutting edges instead of buying a new cutter. Inserts are relatively cheap.
One of my many hobbies is collecting airsoft guns. Given that I am exceedingly poor, I have taken great interest in making airsoft guns and accessories. Electric guns are easy, everyone knows how they work. Gas guns are…not so easy. I mean, the general how is fairly easy to understand, but the mechanical details and the way valves and stuff go together… So I did a lot of digging for information, and that’s when I stumbled upon a patent, as well as the whole ‘Google Patents’ sub-site.
Once I figured out how to search right, my brain’s knack for retaining seemingly pointless trivia whether I want it to or not came in very handy. For instance, a lot of Taiwanese and Hong Kong airsoft company names are seldom given as anything other than acronyms… But the full names— which over the years I have occasionally come across —are what’s on the patent applications.
Examples: ICS = I Chih Shivan Enterprise Co., Ltd. and HFC = Ho Feng Industry Co., Ltd.
And of course the Japanese companies like Western Arms have all sorts of patents. And all these applications have mechanical drawings. Not dimensioned or anything, but I get the idea of what’s going on.
Here’s some interesting patents:
In-Magazine Pressure Reduction Valve (For 12g CO2 cartridges)
12g CO2 Cartridge Gas Gun Magazine (HFC’s patent)
ICS’s design for 40mm BB shower grenades (Not as nice as Madbull’s!)
The Firing and Rotary Magazine Assembly for ICS’s Rotary Launcher
So, I made an order at Harbor Freight to get in on the Labor Day sale, and I used the main sale coupon to get 20% off the already absurd price on their Chinese knock-off ‘Porta-Band’ (Portable Band Saw), getting it for a mere $65. I was going to get their horizontal band saw, but that would’ve been all my money, plus I found out that it wasn’t even on sale. Then I saw the Porta-Band. At any rate, I needed one or the other to cut stock into manageable pieces. Especially cutting down round rod for the lathe.
I’ve only made a few test cuts with it, I’m ordering some more suitable bi-metal anti-vibration variable pitch blades from McMaster, and then I’ll probably be able to really review it next week or the week after.
I also bought their 1500-watt dual-temp heat gun, because I was really getting tired of having to lug around my SMD reflow soldering hot-air workstation just to shrink-tube something! It was 30% off at $10.
I ordered an air compressor, something I’ve desperately needed for YEARS, and it was 20% off, bringing it down to just $104… But for some reason, they dropped it from my order and refunded the money. It wasn’t out of stock or anything. So now I have a compressor accessory set, an air filter, an airbrush hose…and no goddamned compressor! What’s more, if I were to re-order it, I wouldn’t get the $25 off… I’m going to have words with them about that, but for the time being, I said screw it and decided that the $100 could be put into materials for projects in the meantime.
I found these great ear plugs at Amazon. I’ll review them after they get a bit of use!