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Surface finishes

Surface finishes

Surface finishes

(OP)
Where can I find information showing the equivalent SPI finish to a machined surface finish?  Example: 32 microinch is what in the SPI system.

RE: Surface finishes

Whiv,

I don't have access to a full list - but the most common ones I use are as below :-

SPI-C1: 600 grit stone, 10-12 Ra
SPI-B1: 600 grit paper, 2-3 Ra
SPI-A2: Grade #2 Diamond Buff, 1-2 Ra

I think in general the lettering follows the following convention

A   High polish   1 being the best finish grade
B   Paper finish
C   Stone finish
D   Dry blasting


You can find out more information on SPI finishes on their homepage at http://www.plasticsindustry.org/

Hope this helps


Sean

RE: Surface finishes

Sean:

    Thank you for your reply.

Hector

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