Deburring responsibilities - raw casting and finish machined casting

[Tmoose]

Our all purpose drawing (no separate casting drawing ) from the 1930s has been revised 14 times over the years.
Regrettably it bears no " break all sharp edges" note.
I think it is still fair to expect, and require, the machine shop to de-burr any sharp edges they create.

The foundry "cleans up" a couple of cast in slots, and in the process creates some raggedy edges that will not be shared with finished diameters or faces.

When we get the finish parts back, the sharp edged slots in the casting are still sharp edged. Refer to attached image.

I think we will be revising the drawing and perhaps even the RFQ and PO to include a deburring note. Maybe "machine shop to deburr all sharp edges except as noted."

But in the mean time, are there "understood" industry responsibilities or best practices for who deburrs what and when?

thanks,

Dan T

 

[SwinnyGG]

I'd argue that if it's not on the drawing (or not in contract conditions or whatever) it's not owed. The deburring is a separate operation, either with another tool in the machine, or by hand after machining- if you want/need it, you have to ask for it.

 

[Turn_of_the_Screw]

I agree with SwinnyGG, you must specify on the drawing. Deburring can be a costly procedure. The only situation I can think of where the manufacturer would deburr the part without being asked is if they are a small shop trying to attract business, or where not deburring the part creates a safety hazard. For a handful of parts part, the operator working on the part *may* decide to deburr it themselves, just out of habit, but if you have at least a dozen parts, forget about it.

If it isn't on the drawing, and they come back with burrs, you are stuck with it.

 

[gerhardl]

Agree with above. In any delivery of mechanical parts you will get what you have specified. Revise the drawins and specifications!

Another thought if the parts have been supplied from the same source, in or outside your own works since the thirties, and with only minor chanes. Perhaps time to revise totally in cooperation with old a newer suppliers both on construction and price in competition?