Enlarging Holes in Thick Plate

Gallery, Projects and General > How do I??

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BaronJ:
Can you not use a 1" Blacksmiths drill. They have 1/2" shafts and come in imperial sizes. I paid £4 each for mine.

Manxmodder:
Hi Andrew, just going back to Russell T's suggestion of bushing the eyes on the tractor.

Yes it does reduce the pin diameter by 3mm but surely a slightly smaller pin made from a high grade steel could compensate for that.

A couple of other alternatives:Make up a piloted cutter with the pilot a snug fit in the holes and long enough to extend through both holes of the yoke. Drill one side out then with the aid of a bush with suitable external diameter to fit in the enlarged hole and internal corresponding to pilot size enlarge the second hole from the opposite side.
Also Bahco do some very good quality bi-metal hole saws,maybe you could find a suitable size in their range....OZ.

Manxmodder:
Just another thought, what about using an expanding reamer,a little labourious but I think it would get you the result....OZ.

awemawson:

--- Quote from: Baron on May 14, 2014, 12:21:46 PM ---Can you not use a 1" Blacksmiths drill. They have 1/2" shafts and come in imperial sizes. I paid £4 each for mine.

--- End quote ---

Thanks, but starting a 1" blacksmiths drill (which I have) in a 22 mm hole will inevitably snatch and do me some damage :bugeye:

awemawson:

--- Quote from: Manxmodder on May 14, 2014, 12:23:12 PM ---Hi Andrew, just going back to Russell T's suggestion of bushing the eyes on the tractor.

Yes it does reduce the pin diameter by 3mm but surely a slightly smaller pin made from a high grade steel could compensate for that.

A couple of other alternatives:Make up a piloted cutter with the pilot a snug fit in the holes and long enough to extend through both holes of the yoke. Drill one side out then with the aid of a bush with suitable external diameter to fit in the enlarged hole and internal corresponding to pilot size enlarge the second hole from the opposite side.
Also Bahco do some very good quality bi-metal hole saws,maybe you could find a suitable size in their range....OZ.

--- End quote ---

Easiest solution is to turn a stepped pin and leave holes present size. However that is asking for a fatigue crack at the transition point. I really want to beef up the pin so I will go with the 25mm but in reality 1" hole saw that I now have on order.

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