Hex from round stock

[jasperdad]

I'm quoting jobs that have hex shapes on the outside of part. I would like to machine these using round stock. The material calls out for aluminum 2024-T4 or T351 in accordance with AMS 4120, in the drawing view, there is a note on the size of the hex that calls out, in this case, .812 hex stock. This is a P&W part. My question is, can I use round stock and simply cut the hex, or am I required to purchase hex stock?

Thank you

- Rich

 

[3DDave]

Ask the customer for a deviation to use round stock. The stock callout is a contractual agreement.

Be prepared to be rejected because of the cost and time for an engineering analysis required to prove that the substitution is suitable.

 

[pylfrm]

jasperdad,

I hope you don't have to order a custom mill run of 0.8120 = 203/250 hex stock, instead of using 0.8125 = 13/16 available off the shelf.


pylfrm

 

[dgallup]

Generally speaking it is much cheaper to use hex stock when it's available.

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[ctopher]

Call out a general material spec, but not the shape. Let the machinist use hex or round, or whatever is available to get to the final part. This will save cost.

Chris, CSWP
SolidWorks '17
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SolidWorks Legion

 

[Bill B.]

AMS 4120 covers bars, rods and wire. Bars can come in many shapes, round and hexagonal being two of them. Round bar would meet the AMS 4120 requirement. Typically the hex size and tolerance should be listed but absent the tolerance I would default to ANSI H35.2 (dimension and tolerances for aluminum mill products) which is listed in the "applicable documents" section of the AMS 4120 specification. The only caveat would be if the drawing actually calls out "hex stock". I can't think of a situation where the shape of conforming material would make a difference but if it were me I would ask P&W for clarification.