Material Conditions on drawings
Material Conditions on drawings
(OP)
When specifying a material on a drawing, is the finished temper to be listed, or is the pre-machined condition listed with the temper\heat treat requirements added in?
As an additional question... Do part normally get tested post heat treat, or is certification of time\temperature of the heat treating good enough?
Thank you,
As an additional question... Do part normally get tested post heat treat, or is certification of time\temperature of the heat treating good enough?
Thank you,





RE: Material Conditions on drawings
o) Dimensions and tolerances apply only at the drawing
level where they are specified. A dimension specified
for a given feature on one level of drawing (e.g., a detail
drawing) is not mandatory for that feature at any other
level (e.g., an assembly drawing).
RE: Material Conditions on drawings
Usually, parts get tested rather than relying on a certificate.
RE: Material Conditions on drawings
Your drawing specifies what you will accept from your vendor. If you want heat treatment, call it up. It is a good idea to specify that your dimensions and tolerances apply after finishing.
--
JHG
RE: Material Conditions on drawings
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Material Conditions on drawings
Our drawing format has individual blocks for the raw material specification, the heat treatment specification and the finish specification (paint, plating, etc.). If you can't put it in one line in the block then either reference a note or if you can't write it in a couple of lines of a note then write a detailed specification and reference it in the drawing format.
I know some people say you should only specify the final product but after we spend 4 years qualifying a design that was made from bar stock the last thing on earth we want is some supplier to start using powder metal blanks or vice versa. We actually do most machining in house as well as heat treatment but sometimes we get too busy and have to outsource. It's critical that parts we buy outside have the same provenance as parts we make.
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RE: Material Conditions on drawings
RE: Material Conditions on drawings
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?