Enlarging Holes in Thick Plate

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awemawson:
Then made up a stepped alignment peg and a jig. I didn't have any 1/2" plate to hand so welded a couple of bits of 6mm plate together for the jig

awemawson:
Pop the alignment peg in the hole. Clamp the jig round it and off we go :ddb:

awemawson:
End result: a pair of 22mm holes enlarged to 1" - and the barstock that I'll use for pins actually fits :lol:

awemawson:
So far so good. However next job is to weld up an outrigger parallel to the existing plate, as the pins extend past the existing one through a 'top link' (*) swivel eye and without additional support would be be susceptible to bending.

I sliced up a length of heavy 3" x 4" x 8mm angle to form the out riggers - need to bore a 1" hole in the right place then weld them in place. Job for Monday as tomorrow is full with family duties.

(* Top Link is basically a huge turn buckle - a pair of spherically aligning 1" bore eyes mounted on 1 1/8" UNC left hand and right hand threads, with a threaded tube between them allowing adjustment of eye to eye spacing. Conventionally used on a tractor 'three point linkage' as the upper support which needs adjustment to set the angle of the attached implement. In this case being used as bracing supporting the weight of the flail and thus avoiding using the hydraulic raising bars.)

RotarySMP:
Thanks for posting the pictures. Just out of interest, what final size did that 25mm hole saw end up cutting?

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