Wherever Countersunk bolts are provided in a model, it is advised not to send NC DXF files to the client for the corresponding plate/shaft. This is because the hole dia in the generated NC & DXF file is not the actual bolt dia but it is the dia of the countersunk head. Therefore, the hole dia in the plate/shaft is much higher than the actual value. Hence, it is advised not to send NC DXF files for plates/shafts which has countersunk holes.
But, when the client demands for NC DXF files even for plate/shaft with CSK bolts, the generated NC DXF files must be manually edited such that the CSK hole dia in the NC DXF files is bolt dia + 2mm(Tolerance).
Also the tolerance for CSK bolts must be 2mm everywhere irrespective of the members the bolt is connecting i.e, whether it is steel to steel connection or steel to concrete connection the tolerance for CSK bolts must be 2mm.
By Ramakrishnan.L
TEK1
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