A better PCB guillotine - Page 1
Forum section: electronics / testgear

author: akis
author_rank: Frequent Contributor
timestamp: June 15, 2015, 10:30:28 am
content: Has anyone in the UK got metal working equipment?After I paid an arm and a leg to buy a PCB guillotine, (http://www.megauk.com/shears.phpmodel DM9001), it is not actually all that good and it is very simple to make, if one had the metal working tools, actually it would be much easy to make one that is better in a number of ways.It seems Mega UK are the only manufacturers of PCB guillotines, and they charge ridiculous amounts for what is a few pieces of metal, badly put together to form a PCB guillotine.If you live in the UK and have access to metal working machines and tools please let me know.

author: sleemanj
author_rank: Super Contributor
timestamp: June 15, 2015, 11:39:59 am
content: For doing a handful of boards,a couple of rulers, a chunk of wood, a few screws, and a hook knife (aka laminate cutting knife)Slide the board in to the stop which you've set, pull the knife a couple times to score, flip board, score other side, snap.

author: KJDS
author_rank: Super Contributor
timestamp: June 15, 2015, 12:30:38 pm
content: I used to score them either side with a Stanley knife and then slam them in the desk drawer to get an even break.

author: KJDS
author_rank: Super Contributor
timestamp: June 15, 2015, 02:13:22 pm
content: I'm a little annoyed with myself for failing to mention an axe. If you want more precision, rest the axe on the cut line and hit it with a hammer.

author: PaulAm
author_rank: Frequent Contributor
timestamp: June 15, 2015, 02:24:35 pm
content: I use a metal shear. I've also used an old guillotine type paper cutter with good results.

author: djQUAN
author_rank: Frequent Contributor
timestamp: June 15, 2015, 02:46:33 pm
content: I made my own micro table saw for cutting PCBs using a dremel and a diamond cutting disc.http://www.quan-diy.com/projects/dremel/tablesaw.htmI ordered 2" diameter carbide tipped blades from Proxxon to make a bigger version than my previous one.... still waiting for the blades

author: Mark
author_rank: Frequent Contributor
timestamp: June 15, 2015, 04:06:52 pm
content: I have the smaller of the two Mega guillotines, and many times I wish I'd bought the larger one! I had to buy a proxxon mini table saw last week to cut some larger boards. The proxxon cuts well, but there is a slight allignment issue between the sliding guide and the blade which causes friction between the blade and the PCB on longer cuts, I will probably end up adjusting the sliding bar guide to match the blade.For more intricate work including cut-outs etc I have a Proxxon DS 230/E Fretsaw. It's fine for short cuts of a few inches but the blades get blunt very quickly and it's hard to keep a straight line on long cuts, hence the Proxxon KS 230 Saw purchase.

author: Fungus
author_rank: Super Contributor
timestamp: June 15, 2015, 04:40:40 pm
content: Quote from: mojo-chan on June 15, 2015, 12:47:57 pmSaws produce nasty fibreglass dust.Power saws produce nasty fibreglass dust and distribute it around the room.

author: atferrari
author_rank: Frequent Contributor
timestamp: June 15, 2015, 04:59:52 pm
content: Quote from: sleemanj on June 15, 2015, 11:39:59 amThere is a video by W2EAW where he shows exactly that method amongst other alternatives.

author: edavid
author_rank: Super Contributor
timestamp: June 15, 2015, 05:02:20 pm
content: Quote from: Fungus on June 15, 2015, 04:40:40 pmA wet cut tile saw helps with that.

author: akis
author_rank: Frequent Contributor
timestamp: June 15, 2015, 06:05:21 pm
content: Thanks for all the suggestions.For what it's worth, I have used a tile saw, it is like a table saw but has a special saw blade without teeth, it cuts nicely and effortlessly, like hot knife through butter, and it has a tub of water underneath where the blade dips into and traps almost all the powder.However, after having used it for many years, I can say it does not compare to the guillotine at all! The guillotine does not require water and you do not get water splashing everywhere and wet boards when trying to do a cut. The cuts are cleaner with the guillotine, there is less frayed material and copper strands sticking out after a cut. The guillotine cuts in one clean cut, the tile saw requires more effort and guidance.The tile saw is the best there is in speed and no dust - after the guillotine.In my opinion once you have used a proper guillotine you do not really want to go back.My idea is trying to improve on the guillotine by making a better, stronger, longer, more powerful guillotine than the one made and sold exclusively by Mega.The blades are straight and very easy to make. The base is a flat piece of metal again nothing extra special here. Unlike paper guillotines it is a bypass blade and it is not sharp, so you do not need special tools to sharpen razoe edge blades.It is quite straightforward to do for someone that has metal working tools.

author: Fungus
author_rank: Super Contributor
timestamp: June 15, 2015, 06:18:52 pm
content: Quote from: akis on June 15, 2015, 06:05:21 pmA motorized one would be cool. Motorized, with a pedal.(Ka-chop!)

author: German_EE
author_rank: Super Contributor
timestamp: June 15, 2015, 07:43:48 pm
content: Head along to your local printers and ask them to telephone you just before they replace the blade on their paper guillotine. It's a blade about 5cm wide (or bigger) and driven by hydraulics so it will cut through a 75mm stack of paper like a hot knife through butter. Cutting PCB material will however take the edge off the blade which is why you use their machine just before a blade swap.Note: It's a very dangerous piece of kit which is why you tell the operator what you want and they cut it for you.

author: KJDS
author_rank: Super Contributor
timestamp: June 15, 2015, 07:51:06 pm
content: A smaller version of this would workhttp://auction.newengland.co.uk/lots/pearson-8ft-x-14in-guillotine

author: G0HZU
author_rank: Super Contributor
timestamp: June 15, 2015, 11:28:29 pm
content: QuoteI'm in the UK and at work we upgraded to a new PCB guillotine a few years ago after having used the previous one for about 20yrs. The old one still worked but it became notably noisier when cutting FR4 boards and needed a decent tug on the handle to get a clean cut.I don't know what make the new one is (but I can try and find out) but it really is a delight to use. I'm not exaggerating when I say it is effortless when cutting some of our more exotic Rogers PCB laminates. It's almost like cutting cheese slices! I haven't tried it with FR4 but I would expect it to be fairly effortless.However, I don't think it was cheap to buy and it is visibly better engineered than the cheapo lightweight MEGA units.Note:I can't be certain but I think it could be this one here:http://uk.farnell.com/fortex/gu045701/shear-guillotine-pcb/dp/483930Ours is quite big and is very heavy. I thought it was much more expensive than the £650 Farnell price so ours might be a heavy duty version. But it looks very similar!

author: jwm_
author_rank: Frequent Contributor
timestamp: June 16, 2015, 01:25:09 am
content: I have actually just used these in a pinch when working with thin boards.http://www.amazon.com/gp/product/B000FK3WOGI am not sure I'd recommend it though.

author: orion242
author_rank: Unknown
timestamp: June 16, 2015, 02:07:09 am
content: I got a 8" plate shear. Cuts right thru with minimal effort, no dust, water, or noise.https://www.grizzly.com/outlet/Plate-Shear-8-/T23100looks like the 8" is discontinued. Here is the 6"https://www.grizzly.com/products/Plate-Shear-6-/H0732

author: VK5RC
author_rank: Unknown
timestamp: June 16, 2015, 02:27:17 am
content: I have used the combination machine listed in the last link above, good for metal work as well, folding etcEDit typo

author: SeanB
author_rank: Super Contributor
timestamp: June 16, 2015, 05:25:16 am
content: Quote from: German_EE on June 15, 2015, 07:43:48 pmThat is why they always have a 2 hand safety circuit, where you place the work, then press an arm switch then have to press 2 switches placed physically far apart on the machine within 0.2 seconds of each other, before it will operate. Bigger ones have an added optical detector system across the front as well, so that you cannot put your hand there while the blade is coming down.I will add that those blades will typically be resharpened quite a few times in use, as paper and board does blunt them quite fast. Still have a few in my office, which got to the lower sharpening limit. Still sharp enough to shave with, but too blunt for the neat cut you want. You will have around 1cm of blade that can be taken off before you reach the lower wear limit, so you can have quite a few nicks removed from things like staples and such before replacing the expensive steel bar. They make lousy knives though, way too thick in the body, and too brittle for any other use without a good backing.The blade stop is typically a square nylon block, so that you can get 8 stop surfaces out of it before you throw it away, as the blade typically is set to stop 0.1mm into the nylon. Around 200 cycles and there is a chewed edge, so printers will always use a lower cardboard backing to get that last few pages as neat as the top.

author: akis
author_rank: Frequent Contributor
timestamp: June 20, 2015, 07:07:49 pm
content: I bought on ebay an A3 paper guillotine able to cut trough like an inch of paper. It has a long blade that lands on a piece of sacrificial plastic. The blade is extremely sharp.I then used it, foolishly to cut a few PCBs. That almost destroyed the blade. I removed the blade and gave it to a professional sharpener. However on re-assembling the guillotine, it does not cut as well as it used to, the blade does not land perfectly horizontally as it had used to. I cannot see any obvious adjustments to tweak the angle of the cut...