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  1. TokyoChris

    Deep hole tolerance costs

    Thanks. I'll pose it to my boss when he's back, but I think he's pretty set on just gun-drilling. Thanks, mate. From my hand calcs, this heater should only expand 90microns or so up to 150C, which wouldn't reach the 4.1mm hole even at the manufacturer's upper diameter tolerance limit (let...
  2. TokyoChris

    Deep hole tolerance costs

    Thanks for the direct advice! ED bore? What's the ED? I guess the cost limit is up to my boss. I figured that a slight cost increase for higher efficiency should at least be considered.
  3. TokyoChris

    Deep hole tolerance costs

    You're right - should've subtracted instead of adding. Either way, the expansion would be difficult to accurately predict. So long as the heater doesn't expand drastically faster than the plate hole, it should be of no real concern. The same problem would occur in the alternate design.
  4. TokyoChris

    Deep hole tolerance costs

    Thanks for the replies, guys. The heater is 304SS and they haven't specified any other flexibility other than the dimensional tolerance. The plate is an aluminium alloy used to transfer heat. Presumably the vertical variation shouldn't have too much influence on the heating itself. The...
  5. TokyoChris

    Deep hole tolerance costs

    I'm a design engineer at a company in Japan and I need to design a plate in which to insert a heating element. The heater is cylindrical with a 4mm OD (+0, -0.08), and the plate is 170mm long in the direction of the heater. The manufacturer's recommendation is a hole machining clearance of "0.05...

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