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Practical notes for buyers and engineers, from the shop floor in Mumbai.
A purchase order for 50,000 pieces, and no size on itLast month a purchase order came in from a customer we have supplied for over ten years. Fifty thousand pieces…Point two of a millimetreThis month we agreed a price with a customer on a washer 1.60 mm thick. Their drawing said 1.80.…One drawing number, two different sizesAn enquiry came in last month for eleven sizes of fibre washer. A clean list, a drawing number against every l…The most argued dimension on a washer drawing is the holeEvery assembly line that puts a washer on a screw by hand has an opinion about the hole.…The line on the last page that decides when we get paidRead to the end of a purchase order. This month one of ours had a line near the bottom asking for a mill test …Nitrile is the right rubber until you put it outsideNitrile is the rubber everyone asks for, and for anything touching oil it is the right answer. Put the same ni…A copper washer seals because it is softA copper sealing washer works by being softer than the two faces it sits between. Tighten the bolt and the cop…Two PTFE washers, same die, very different partsTwo PTFE washers can come out of the same die, look almost identical, and be very different parts.…Tell your supplier the yearly number, not just this orderWhen we quote, we ask two quantity questions. How many on this order, and how many in a year.…
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