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raymw

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    If you're hungry, I won't give you a fish. I won't give you a fishing rod, either, but I may show you how to build a trawler.

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  1. I used to get 'remould quality' tyres. They were always new tyres, but were often in sizes that had been overstocked, or ones with perhaps a tread pattern defect from the mould.
  2. The blade profile is optimised to do most jobs, most likely none of them particularly well. The offset from the centre line will have to be significant, if the friction to rotate the blade is high. So, if you reduce thart distance, I would guess you will need to take very light passes to reduce the friction caused by pressure, but not so light that there is not enough pressure to turn the blade. If you make the rear edge more vertical (the point more acute) then the tip of the blade will be weakened, and will most likely not stay sharp for long. I guess you will need more than one blade to successfully experiment, but seeing as it is not doing what you want at the moment, then you may as well have a go. The photo is of three spare blades for a hand held swivel (drag) knife. the rule calibrations is in mm. They simply fit loosely in a hand piece, plenty of slack, but the blade is actually 'leaning back, and is quite acute, Because it is most likely stabbed into the sheet when starting the cut, and being controlled by hand, more sensitivity can be applied compared to being machine driven. The blades and knife handle were bought from 'the Range' a few years ago, for not much money, but it may be possible to adapt your blade holder to take them. e.g. pull out your steel blade, and drill plastic to take these blades
  3. During a visit to my doctor, I asked him, "How do you determine whether or not an older person should be put in an old age home?" "Well," he said, "We fill up a bathtub, then we offer a teaspoon, a teacup and a bucket to the person, to empty the bathtub." "Oh, I understand," I said. "A normal person would use the bucket, because it is bigger than the spoon or the teacup." "No," he said. "A normal person would pull the plug. Do you want a bed near the window?" DO YOU WANT THE BED NEXT TO MINE?
  4. The Story of the Haircut With barber shops and hair salons closed in most states this story is very timely. We all need to pitch in and help one another during times of stress, difficulty or danger. Enjoy this story. There are lessons to be learned from it. The Story of the Haircut Blessed are those that can give without remembering and take without forgetting. One day a florist went to a barber for a haircut. After the cut, he asked about his bill, and the barber replied, 'I cannot accept money from you, I'm doing community service this week.’ The florist was pleased and left the shop. When the barber went to open his shop the next morning, there was a 'thank you' card and a dozen roses waiting for him at his door. Later, a cop comes in for a haircut, and when he tries to pay his bill, the barber again replied, 'I cannot accept money from you, I'm doing community service this week.’ The cop was happy and left the shop. The next morning when the barber went to open up, there was a 'thank you' card and a dozen donuts waiting for him at his door. Then a Congressman came in for a haircut, and when he went to pay his bill, the barber again replied, 'I cannot accept money from you. I'm doing community service this week.’ The Congressman was very happy and left the shop. The next morning, when the barber went to open up, there were a dozen Congressmen lined up waiting for a free haircut. And that, my friends, illustrates the fundamental difference between the citizens of our country and the politicians who run it. As Ronald Reagan said: "Both politicians and diapers need to be changed often and for the same reason.”
  5. raymw

    Panic buying

    If you're a coop member (maybe if you're not) you can phone their ho, and they'll credit you the amount outstanding, and maybe a bit more.
  6. You can spend a few minutes thinking up words, and go to https://www.thisworddoesnotexist.com/
  7. I get them from Paypal, except they are not from Paypal...
  8. This reminds me of something I saw in Engineering magazine, a number of years ago. Iirc it was an electric loco in India, stopped on a slight gradient, without brakes applied for a fair amount of time. The driving wheels slowly rotating in the same spot, melted half way through the track.
  9. Old people can often just do what they want - they don't have so much to lose.
  10. Ajoke from another time, or another place... So, I was in the McDonald’s drive-through this morning and the lady behind me honked at me and flipped me off because I was taking too long to order. Wow. “Take the high road” I thought to myself. So I paid for her food. I moved up and she leaned out the window looking all crazy at me because the cashier told her I paid for her food. She felt embarrassed. When I got to the second window to get my food, I showed them both receipts and took her food too! I paid for it, it was mine! Now she has to wait even longer. She’s gonna learn today you just don't mess with us old people.
  11. fwiw, the router is most likely fine, but you'd get a better finish in ply with a decent down cutting bit. It may be a bit late for you, if you've done all the slots, but Here is a link to the sort of bits I refer to - https://www.shop-apt.co.uk/2-flute-down-cut-carbide-routers-for-wood-mdf.html A simple ply/hardboard jig can be made to limit the travel of the router since you'll need to make more passes to get the required width of slot, provided the 6mm shank will fit the B&D collet.
  12. nought wrong with Lenovos - old or young...
  13. Hi Ian, very nice experimentation you're doing there. I do not have any of these machines, but a few comments may be useful. The plastic sheet is sort of sticky. It is the type of problems that folk get when first machining aluminium without using any lubrication. When cutting plastic with a knife blade, the displaced material will need to go somewhere, generally forming a raised lip ( a burr) at the edge of the cut. However, on these machines, the depth setting is governed by the depth stop rubbing on the surface of the material, which will cause more friction, and obviously the stepper motors are cogging -missing steps- and as you say you may as well give up when that happens. Taking a number of lighter cuts may overcome that. Using a more brittle material may also solve that problem. The machines are flexing too much for heavy cuts, but I expect they are ideal for cutting paper and some fabrics, It may not help, and you may not want to try it, but perhaps first giving the plastic a light spray of a lubricant (WD40?) may reduce the friction, or try different plastic sheets. The software, looks to be very buggy too. for cutting any shape with lines at right-angles, you only need two' walkabouts', if the cutting blade can be retracted. Of course, more walkabouts may increase the speed of cutting the job, since it will not be taking time cutting air to return to cut the next parallel line. Do you know the final code that the machine uses, hpgl, g-code, whatever, or do you not have access to that? Best wishes, Ray
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