Steel Washer Design
Steel Washer Design
(OP)
Is there a general guideline for the design of washers for use with oversized holes?
Dik
Dik
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RE: Steel Washer Design
http://ruland.com/ps_collars_shaft_sc.asp
RE: Steel Washer Design
Dik
RE: Steel Washer Design
with oversized anchor rod holes.
There's a rule of thumb for plate washers. The thickness of the washers be a minimum of one-third the diameter of the anchor rod, and that the length and width of the washers equal the hole diameter plus one inch.
Chapter 9 of Guide to Design Criteria for Bolted and
Riveted Joints by Kulak, FIsher, & Struik - I believe it's a free download from AISC has guidance, which says in part:
"DESIGN RECOMMENDATIONS FOR OVERSIZE AND SLOTTED
HOLES
Hardened washers are to be inserted under both the head and the nut if oversize or
slotted holes are placed in the outside plies of a connection. A490 bolts with
diameters greater than 1 in. should have at least 5/16-in. thickness material under
both the head and the nut in order to bridge over a slotted or oversize hole. (Use of
multiple washers to make up the thickness will not be satisfactory.) If this
additional material is hardened, no washers will be necessary. However, if ordinary
structural steel plate is used, standard hardened washers should be added under
both the nut and bolt head."
RE: Steel Washer Design
Even with OEM sized foot holes there was danger of multiple standard washers "coning" and moving the motor back to a prefered (by the washer, not me) position. I'd torque a few bolts with various thickness or stacks of washers to establish a thickness that ensures even temporary coning can not happen.
RE: Steel Washer Design
Dik
RE: Steel Washer Design
It is well worth the $15.00.
Structural Bolting Handbook 2006
h
If you decide to get the Bolting Handbook here is another good one for the same price.
Structural Welding Quality Handbook 2008