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Type: Posts; User: malb

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  1. Replies
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    1,444

    Motor is NOT pumping out 275W, that's what it is...

    Motor is NOT pumping out 275W, that's what it is sucking from the source (battery). If it is free running (running without a load), it is pumping out absolutely nothing, and that entire 275W is being...
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    For the loads you are contemplating, forget 12V...

    For the loads you are contemplating, forget 12V completely, the currents are way to high. Look to a 24V, 36V or 48V inverter instead and instead of running batteries in parallel, run them in series....
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    I also have a H&F 1ton gantry that I use to move...

    I also have a H&F 1ton gantry that I use to move stuff when we shifted to Alex and into our new place some time after. Also have an ancient Maximove pedestrian 1T fork for handling one end of the...
  4. Thread: Cutoff disks

    by malb
    Replies
    21
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    1,408

    I'm not sure that a mattress or any thing else...

    I'm not sure that a mattress or any thing else flammable would help with a metal cutting circular saw. They produce a lot of very hot chips that have a degree of mass to them and travel at a...
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    I figure that the video explains itself well, you...

    I figure that the video explains itself well, you need to remachine the form every two or three rivets, and you need to tighten the drill chuck by belting the key with reasonably heavy hammer (wheel...
  6. Thread: Mobilco Heavycut

    by malb
    Replies
    24
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    5,311

    I used one the best part of 40 years ago, they...

    I used one the best part of 40 years ago, they are a great machine. They really need the ratchets in the drive to turn corners, but by their nature, they will make a reverse gear totally redundant,...
  7. Replies
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    1,320

    Specialty Saws are in Croydon, used them...

    Specialty Saws are in Croydon, used them constantly for cold cut blades for years while in the metal furniture trade, then for metal and wood bandsaw blades after, also for planer blade...
  8. If something takes a tumble during loading...

    If something takes a tumble during loading (presumably after being paid for) and their staff are assisting with handling it, who becomes liable for damage to item or other items, transport vehicle,...
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    940

    Interesting to see the action in close up. Steve...

    Interesting to see the action in close up. Steve Summers video last night showed a newly acquired full on integrated relief grinding machine, complete with built in optical comparator that a friend...
  10. Looking at your first picture, the windings in...

    Looking at your first picture, the windings in the lower half are significantly darker than those above, and there appears to be some bare copper showing. This would suggest that some windings may...
  11. Used to put stuff like that together, agree that...

    Used to put stuff like that together, agree that the base is ali alloy and the stem will be chrome plated, which explains why the base is not mirror polished and the stem is. It's possible to mirror...
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    1,650

    Not necessarily, your speed controller can only...

    Not necessarily, your speed controller can only control rotational speed, reducing speed reduces cooling available to the motor (assuming some sort of fan cooling), which imposes a limit on the...
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    3,544

    The solid state reverser in the pic above is...

    The solid state reverser in the pic above is exactly that, it is not an on/off switch. If you follow the diagrams on it, it can direct or cross connect switch 2 of the phases, but the third phase is...
  14. Replies
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    3,544

    I would be looking to replacing the switch as I...

    I would be looking to replacing the switch as I suspect that you have burnt contacts. In 3 phase installations, an E Stop would normally be incorporated in the coil circuit of a contactor, rather...
  15. Replies
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    2,237

    If I am seeing things correctly in the pic, they...

    If I am seeing things correctly in the pic, they appear to be two dowel pins to locate a plate that in turns secures the leadscrew visible. They certainly have the appearance of being parallel rather...
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    1,105

    I assume that the unit being restored is a...

    I assume that the unit being restored is a different size to the donor spools, so a spool and handle transfer is out of order.

    I was around these units a bit as a kid and teenager and think I have...
  17. Thread: CAD Course

    by malb
    Replies
    40
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    4,155

    If you can get a download working, have a search...

    If you can get a download working, have a search on YouTube for training videos, there are some good ones there, including some from Autodesk.

    Another option would be Skillshare who have a vast...
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    2,154

    Have you checked the oil level in the compressor...

    Have you checked the oil level in the compressor sump? Low oil would increase friction and compressor temperature, and hence load on motor. You are seeing an increase in load between the motor free...
  19. Dumb questions, does it need to be SS, won't MS...

    Dumb questions, does it need to be SS, won't MS do, and does it need to be fixed to the base of the ali pot?

    We have a nice expensive European induction hotplate unit in the kitchen, and an...
  20. Look on the page for the Vevor unit and scroll...

    Look on the page for the Vevor unit and scroll down to the Other Items section. They offer a 500kg electric that is cheaper than the Bunnings one and also more compact and a reasonably balanced...
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    I suspect that assuming a 10K RPM limit for your...

    I suspect that assuming a 10K RPM limit for your blades is somewhat optimistic. Are any of the blades marked with a maximum speed, are they carbide tipped or plain carbon steel or high speed steel. I...
  22. Yeah Grahame, I am aware of the waiting and...

    Yeah Grahame, I am aware of the waiting and priorities for theatre time, had 23 days in hospital after a ride on mower roll over earlier this year perforated a major vein in my leg . (Blades not...
  23. Thread: Boiler plans

    by malb
    Replies
    7
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    683

    There have been a lot of boiler construction...

    There have been a lot of boiler construction articles in Model Engineer over the years, mostly for model loco's and traction engines etc. However they are generally published over a number of issues,...
  24. Thread: Monarch lathe

    by malb
    Replies
    4
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    1,096

    It's a 1942 Monarch CK, they seem to have been an...

    It's a 1942 Monarch CK, they seem to have been an excellent machine when new, and appear to be well regarded by the better known names among the US YouTubers.

    But despite having had good bones,...
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    It's interesting and viable, provided that you...

    It's interesting and viable, provided that you have suitable gears to copy from, i.e. a matching tooth count or the reference tooth count is a multiple of the desired tooth count. For example with...
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    I would also want to know something about the...

    I would also want to know something about the voltages that are present around the existing pot, and the voltage rating of the replacement pot. I suspect that most compact pots are either low voltage...
  27. Thread: UPS info

    by malb
    Replies
    16
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    4,816

    Bob, I have had nothing to do with 3D printers,...

    Bob, I have had nothing to do with 3D printers, but have had a similar UPS supplying my NBN Fixed Wireless transceiver and modem for a few years. All our computers are laptops with 5hr+ batteries so...
  28. Replies
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    8,479

    Take into account the reduction ratio required to...

    Take into account the reduction ratio required to get your 500W motor from 3000RPM at the motor shaft to 12RPM at the drive wheels, it's 250:1. Three stages of 5:1 reduction is 125:1, and you still...
  29. Thread: Free lathes?

    by malb
    Replies
    14
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    2,012

    I believe that the green coloured machine is a...

    I believe that the green coloured machine is a clone of the Emco Unimat SL, rather than an early Sherline. The motor mount is rotated 180 degrees at the headstock, i.e. motor should be behind the...
  30. Replies
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    3,418

    Is the breaker that tripped just a circuit...

    Is the breaker that tripped just a circuit breaker, an earth leakage breaker, or a combination of both? If either of the last two, the breaker would have a button marked TEST as well as the ON/OFF...
  31. Replies
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    Not trying to be a pedantic pain but should that...

    Not trying to be a pedantic pain but should that not read P1/T1=P2/T2. Otherwise the equation reduces to P1=P2 when you cancel the common denominator of T1.

    Just seeking clarification for others...
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    Nev, I haven't looked up the web page they refer...

    Nev, I haven't looked up the web page they refer you to, but the following is my take on it.

    1. You save about 5c/KwH before GST for general consumption between 9.01pm and 3.59 each day. This is...
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    I would be reluctant to bolt a moderately light...

    I would be reluctant to bolt a moderately light lathe to a typical shed/garage style concrete floor for the simple reason that the floor itself moves with moisture content of the soil underneath....
  34. Replies
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    1,849

    Google rotary cutter blade sharpener. They are...

    Google rotary cutter blade sharpener. They are available locally for a similar price to the blades but will do many blades. Basically a plastic ring with an annular stone inside with an appropriate...
  35. Thread: Hot Knife

    by malb
    Replies
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    4,000

    I can't find enough data about voltage and power...

    I can't find enough data about voltage and power consumption to decide whether a moderate sized stepdown transformer might be a viable option. However the link to the datasheet in the provided link...
  36. Replies
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    And a few buckets of rigidity for the lathe. A...

    And a few buckets of rigidity for the lathe. A lathe with a milling adaptor may do a reasonable job of very light milling, but they generally can't handle loads that that that style bit could impose....
  37. Replies
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    19,687

    My guess would be clamping something to something...

    My guess would be clamping something to something else that is round. Shallow disk is fits into a recess and a bolt passes through it to the longer part with the semicircular cutout, bolt tightens...
  38. Thread: Mobile Scaffolds

    by malb
    Replies
    12
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    1,311

    My unit similar to the yellow one came as five...

    My unit similar to the yellow one came as five parts, 2 x welded end frames with removable castors, 2 x welded side frames that clip and pin to the end frames, and a welded deck frame with plywood...
  39. Thread: Mobile Scaffolds

    by malb
    Replies
    12
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    1,311

    I have had a unit similar to the yellow unit in...

    I have had a unit similar to the yellow unit in the first post, with a couple of variations, the platform floor is one piece (i.e no lift up hatch section) and it has round tube sections at the top...
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    3,490

    If you are familiar with the technique of...

    If you are familiar with the technique of threading with the half nuts closed all the time, provided you get the gear train correct for the particular pitch you are cutting, the method should work...
  41. Replies
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    1,634

    They are low speed and friction drive, literally...

    They are low speed and friction drive, literally the smooth and bare motor shaft (6-8mm) driving a rubber or plastic disk on a through shaft with the wheel and lap mounted. My older one uses plain...
  42. Replies
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    4,173

    The engine is definitely a 2 stroke gas (petrol)...

    The engine is definitely a 2 stroke gas (petrol) engine, these were the more common mechanical propulsion for free flight models in the period just after WW2. Fuel would be similar to a current 25:1...
  43. Thread: Biax Scraper Info

    by malb
    Replies
    43
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    4,421

    The motor power rating is the maximum power level...

    The motor power rating is the maximum power level the the motor can be operated at long term at whatever duty cycle the manufacturer specifies. Off load the motor alone would be in the 85 to 100W...
  44. Thread: Fred Dibnah

    by malb
    Replies
    4
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    1,038

    Fred was an interesting guy doing lots of...

    Fred was an interesting guy doing lots of interesting thing. There are quite a few other videos on you tube about his various exploits in his daily work, his restoration work etc. The video linked to...
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    Sorry Steve, I did find it in the cabinet draw...

    Sorry Steve,

    I did find it in the cabinet draw that I thought it would be in, it is Weldon, it is 27mm dia, but damn it, its 60 degrees not 82. I knew it was some very odd angle for general local...
  46. Thread: Clamp setup

    by malb
    Replies
    13
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    2,176

    With moderate clamping pressures, the method...

    With moderate clamping pressures, the method depicted should allow less flexing of the tube than clamping it V blocks because it is constrained in the three directions that would allow deflection...
  47. Replies
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    2,031

    I believe I have a 27mm dia 82deg Weldon in a...

    I believe I have a 27mm dia 82deg Weldon in a set, would be happy to post to you if I find it tomorrow, looked in the house storeroom just now and found a newer set to 25mm but 90 deg. I eliminated a...
  48. Thread: Clamp setup

    by malb
    Replies
    13
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    2,176

    My read is that user is drilling multiple holes,...

    My read is that user is drilling multiple holes, doesn't want the vise jaws deforming the tube so has it set to confine the tube rather than grip it tightly, and uses the bar and clamps as a holddown...
  49. Thread: Where to live

    by malb
    Replies
    19
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    4,880

    The yanks had old B17 bombers converted to drones...

    The yanks had old B17 bombers converted to drones and controlled from crewed B17's operating out of the UK for attacking high value extremely defended targets such as U boat pens toward the end of...
  50. Replies
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    1,425

    One cool machine, lots to "disguise" the...

    One cool machine, lots to "disguise" the mechanics, the woody wheels, that sneaky little cheater hole in the muffler, and a superb frame and body job and integration of old style and newer driveline....
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