What's new
What's new
By:
Advanced search…

Search results

  1. Toolrunner

    Any old textbook that details sand casting of engines?

    Thanks for both suggestions -- turns out, they are both the same source -- Steve Chastain's "Metal Casting: a sand casting manual for the small foundry". The v8 flathead production is covered in vol 2. Some info on engine casting also in vol.1. I had those books on my shelf and had overlooked them.
  2. Toolrunner

    Any old textbook that details sand casting of engines?

    I've been searching online for any old industrial textbook that details how to sand-cast an engine block with cores. No luck so far. Any suggestions?
  3. Toolrunner

    What is this old grooved-pulley clutching mechanism? How does it work?

    Asquith, thanks for the photos of the New Zealand example - was that at a museum, and if so, where? Also, you've nailed it as far as the origins of the mechanism are concerned - by James Robertson in the 1850s. For what it's worth, I ocr'd the text of his paper in that old copy of...
  4. Toolrunner

    What is this old grooved-pulley clutching mechanism? How does it work?

    Thanks so far -- I'm on the run but I just wanted to acknowledge these replies. I have had a quick look at the youtube video of the Malcolm Moore attachment to the Fordson tractor, in franco's link. Well spotted, franco, that really does look to be the mechanism. Seems that Grigg guessed it...
  5. Toolrunner

    What is this old grooved-pulley clutching mechanism? How does it work?

    I am having trouble finding out about the clutching mechanism shown in the photos below. It was part of cargo hoisting machinery popular in the 1910s to 1960s on small Australian coastal trading vessels, and I suppose also their British counterparts. The first pic below is of a Smart & Brown...
  6. Toolrunner

    Can I run a 550W 3ph motor on a 550W VFD?

    Brilliant reply - that sorts it out for me! Thanks and thanks again.
  7. Toolrunner

    Can I run a 550W 3ph motor on a 550W VFD?

    Seller is an automation training facility and the item, one of a set being sold off, is described as in excellent condition. But of course anything like this second-hand will have some risk of failure. However the price seems good enough to take the risk. The thing is though I don't know if...
  8. Toolrunner

    Can I run a 550W 3ph motor on a 550W VFD?

    I have an opportunity to buy a quality used variable frequency drive cheaply. It's a SEW Eurodrive 0.55kW VFD with 1ph input and 3ph output. It has a continuous output current rating of 3.3A. Would I get away with using it on a new 0.55kW 3ph motor, rated at 2.5A in delta (that's 240V delta -...
  9. Toolrunner

    semi-OT. If working alone do you ever find yourself talking to yourself?

    If, like me, it's a habit you'd prefer doesn't form and spill out of the workshop (visions of muttering geriatrics), a radio helps. Not talkback, race calls, tinny pop music or yelling commercials, because at least for me, all those razz my mind up too much and interfere with concentration...
  10. Toolrunner

    For my curiosity - How did the word "import machine" or "import tool" come to mean

    In Australia, people just refer to 'Chinese lathe' or 'Chinese mill', or 'Taiwanese lathe, mill'. The term e.g. 'import lathe' isn't used, but I think would still be understood in the American sense of Asian-made machinery. Mostly though, the importers are successful in that people usually use...
  11. Toolrunner

    Oil seals for milling machine gearbox

    Thanks, Mark. Good answer. Ian
  12. Toolrunner

    Oil seals for milling machine gearbox

    I am replacing the oil seals on the shafts in the traverse speed gearbox on a 1960s British mill (Tom Senior). The ones that came out were common nitrile-with-garter-spring single lip types (SC in some manufacturer's codes). They are small Imperial sizes (e.g. 5/8" ID x 1" OD). In buying...
  13. Toolrunner

    Gearing calcs - what is value "1.157" for dedendum derived from?

    Heh, I think I saw that bit in the books and skipped! It seems though from your quoted formula, that neoclassicism only applied to 14.5 pressure angle, not the others. Now hang on, while we're at it, how did they come up with 14.5 deg (or 29 deg included angle) - was that inspired by...
  14. Toolrunner

    OT:Are Rolls Royce sheet metal still hand made

    There was an English TV documentary dating from the early 1990s that showed the making of RR autos at that time. A feature was the hand-made radiator, where the narrator's claim was that no automated die process could imbue it with the entasis - the subtle curvature in the apparently straight...
  15. Toolrunner

    Gearing calcs - what is value "1.157" for dedendum derived from?

    Forrest, that's awesome, that you know that. And funny. Yeah, totally ... a reference back to the Pythagorean sacred geometry underlying greek temples - a touch of neoclassical style so popular in the 19th century! Who would have thought that even gearing calculations would be given such...
  16. Toolrunner

    Gearing calcs - what is value "1.157" for dedendum derived from?

    Mud: maybe, but if so, I can't see how you'd get that into a formula that ends up with 1.157. There probably is a clearance factor (0.05, for example) hidden in there, that would have been appended to a principal term that derives from calculation of the involute. Somewhere (maybe in a...
  17. Toolrunner

    Gearing calcs - what is value "1.157" for dedendum derived from?

    Thanks Malcolm, oh yes, that's right it's 1.157/P, not 1.157*P. My mistake not reading back thoroughly before posting. Anyhow, I'm not sure that gets any closer - if 1/64th was involved, that would only have been for a specific range of gear diameters: the fillet would be bigger on giant-size...
  18. Toolrunner

    Gearing calcs - what is value "1.157" for dedendum derived from?

    I'm just doing a set of worm gearing and spur gearing calculations by spreadsheet. The old books say to calculate spur gear dedendum as diametral pitch x 1.157 Why 1.157? It's a constant, obviously. But what is it derived from? The practical point is that then I can get the spreadsheet to...
  19. Toolrunner

    Hi Asquith. I just came across a couple of your posts about steam derrick cranes. You seem to...

    Hi Asquith. I just came across a couple of your posts about steam derrick cranes. You seem to have taken a few snaps of crane manufacturers' nameplates. Wondering if you have any that are diamond shape? Let me explain ... I travelled from my home in Canberra (Australia) to Helidon in Queensland...

ABOUT PRACTICAL MACHINIST

With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. Register for the world’s largest manufacturing technology forum for free today to stay in the know.

Learn more about us.

STAY CONNECTED

Facebook Instagram YouTube LinkedIn Pinterest Twitter Tiktok

Register Become a forum member. Register today.

Sign Up Sign up for our e-newsletter.

© 2024 Copyright Practicalmachinist.com. All Rights reserved.

Back
Top