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alan macdougall

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Everything posted by alan macdougall

  1. Thanks Alan, ive upped the holes to 7mm for a m8 tap. Unfortunately my cheapo tap holder decided to strip its threads on me, so ive been using the drill press and just manually turning the chuck with the tap fitted, to thread the holes. Its time consuming, but cheaper than buying another tap wrench. ive also shortened the main body of the grinder to 300mm or 12 inches, from 400mm or 18 inches it was just too long, but I never thought to check the belt length against it. I got the shouldered bolts to fit the wheels today and after measuring roughly where the belt would go, decid
  2. there is something to see. Its starting to take shape now. ive got some wheels too but am waiting for the shouldered bolts to fix them. its a beast and weighs a ton, but it will be zero flex id say. its obviously not finished and I will be hacking more lumps of steel off it to lighten it a bit, but the basics are there. Couple of questions? do you think m6 bolts will do to hold the box framework together? And platen. im making the platen detachable, with a fixing top and bottom (platen plate will fix to 10mm thick angle. do you think the heat differencial will cause
  3. thanks Alan. Thanks for clearing that up. . Do you have any opinions on the density of the insulfrax , the pipe fittings and the other stuff mentioned in my first post .? thank you.
  4. this is as far as I got yesterday, lots to do. im wondering about the hole at the back, I see some with this hole and some without. What is it for? just to add air?
  5. hello, im making a small propane bottle forge, and have a list of parts needed for this. I understand that galvanised pipework and reducers etc are not suitable, and am looking for black steel fittings, here in the uk. im also aware that the galv stuff is usable after a vinegar soak for a few days. Can I ask what these fittings, and pipework are original meant for, to help me track them down? is it for industrial gas systems or? im also looking at ceramic insulating wool blanket type stuff to line the bottle with. ive come across a product called insulfrax,
  6. Thanks. I have made a start on this and have roughed out the shape of the aluminium platen plate, while I wait on the steel delivery to land. im waiting on delivery of a bench drill. its a Meddings, its an old English make, very solid and accurate, and about 3 times the weight of the modern Chinese garbage, This thing will easily outlast me, and its accuracy will help with all the drilling and tapping im gonna have to do. im also going with the proper 3 phase motor and invertek VFD. Life is too short, the Chinese alternative wouldn't last very long, and its only money right.
  7. it looks really solidly built, how is the gas strut for tensioning ?
  8. Thanks Alan, I was considering a 2nd tooling arm which I could keep for a couple of uses, one being for a (detachable mount) contact wheel, and another being a detachable mount smaller wheel (say 20 or 30mm dia. ) for grinding out for fore finger quillons and smaller radius fullers etc. Any ideas on the small wheel diameter which would prove to be the most useful, as im only going off the radius of my fat fingers? My older bro is coming over tonight, to help out the design part, as he is a "proper" engineer, having served his time in a traditional foundry/ coppersmiths, befo
  9. cool, thanks Alan, I will stick with the 2nd arm. its a steep learning curve, but you guys who use these machines all the time will know what works, what can be improved and whats not worth bothering about, I will keep the 2nd tooling arm. I was also planning a small wheel attachment eventually and possibly a contact wheel too, but I will start with the basics. I can get the materials ordered tomorrow or Friday, im itching to get started. thanks for your help, I really appreciate your input. is there any part of my design that you think could be improved upon, given
  10. good to know I can save some cash on the tooling bars. I had nothing to go on for the sizes, so thanks for that, the rest can be scaled down to suit. im a bit stuck between the separate tooling arm for the rest or just attaching it to the tooling arm which is connected to the platen. im thinking if its mounted on a separate tooling arm, there is more room for movement or deflection. any opinions on this . I see kmg don't bother with a separate arm, and it would save some bucks.
  11. here is the first of possibly many designs, let me know what you think. the pic has kinda cut off the dimensions for the side plates and top middle and bottom plates which hold the tooling arm, but its side plates are 400mm by 130mm by 10mm, the top middle and bottom will be 51 or 52mm to allow the solid alu bar to slide in and out. The alu bars will be held in place by 2 No m12 lever handles per bar. The 380mm length on the platen support frame, or whatever its called is just because I have a scrap piece of 10mm thick aluminium. Apologies for the metric measurements to
  12. Thanks for the replies, but im going to go ahead and build this. I will make the majority of the frame, and will just wait til I have the spare cash for a proper VFD and motor. The final design is a concoction of various designs ive seen while watching about 186 youtube videos on both diy grinders and manufactured ones. Now since I have zero experience of using these things, I would like to ask a couple more questions if I can. For those who have used these in anger as it were. The detachable post which holds the platen. Would I be right in thinking that this would be better if it
  13. Thanks Wayne, ive had a look at the motors, but unfortunately, im trying to do this on a budget, to see if knife making is for me, and I think the postage on a heavy motor and customs tax etc would rule it out, but thanks for linking me to your site, I really enjoyed looking at your forging art, its excellent. timgunn, thank you for making this subject much easier to understand, I appreciate your knowledgable answer, and have sent you a message about the motor and a question regarding cheaper vfd's.
  14. thanks for the replies, im struggling to find a 3600rpm motor. the ones im looking at run 2 pole to 3000rpm, or 1500 to 4 pole. .
  15. hello, I am new here and am just looking for a bit of advice from the knowledgable. im shortly going to be making a 2 x 72 belt grinder. I looked at a few treadmills but they only have smaller 1 kw motors, and I think I really need closer to 2kw, or at least 1.5 (advice taken on this), but im of the thinking if I get a bigger motor it should have more torque im looking at a 3hp, 2.2kw single phase one.. what do you think? good idea or overkill? I was also looking at vfd's and to be honest I don't really have a clue on these. ive found one (not sure if im allowed links or not so I wo
  16. Useless information alert - the design of the celtic knot dates back to the 6th century, and originated in Northern Italy/ southern Gaul (France), before appearing in Ireland and Scotland in the 7th century, so its definitely public property. The Sgian Dubh looks fantastic, id proudly wear it with my kilt.
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