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| Arbalist:
This is a really good article. http://en.m.wikipedia.org/wiki/List_of_screw_drives I never understood why we continued using Philips screws and to a slightly lesser degree Posidriv(e). When I went to Canada over 12 years ago I was intrigued to see "Robby" drivers and screws and bought a few drivers, inserts and a couple of boxes of small screws. Given the choice I don't think I'd use any other type of wood screw. |
| awemawson:
Almost entirely driven by the needs of assembly lines. A cruciform socket self centres and engages quickly - think air operated drivers suspended of balances in a production set up. Then try and use the Robertson square drives - you'd never get the square peg in the hole fast enough. (Many Launderette tumble driers are imported from Canada into the UK (Huebsch) and have the square drive screws) |
| Bigbadbugga:
I guess that square drive is fine for most applications when screwing into wood and other soft materials, but when higher torque is needed you need the extra drive contact offered by the torx and other multi edge drive systems. |
| Arbalist:
--- Quote from: awemawson on June 22, 2014, 07:12:02 AM ---Almost entirely driven by the needs of assembly lines. A cruciform socket self centres and engages quickly - think air operated drivers suspended of balances in a production set up. Then try and use the Robertson square drives - you'd never get the square peg in the hole fast enough. --- End quote --- I knew about the history of cross head screws, its also covered in the link. :doh: I'm talking about us, not industry, and more specifically wood screws. Of course the last dishwasher and washing machine I bought were covered in Torx screws so perhaps when I said "us" perhaps I should have included industry as well. I have bought Robby screws here before, Nettlefolds used to sell them but I've just found this site. http://www.squarescrews.co.uk/ If you have any large woodworking projects give them a try. |
| awemawson:
.... sorry I spoke :bugeye: |
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