Advice wanted on drilling four special holes...

[Eric The Viking]

The roll pin has made the holes off-round, which is part of the problem.

There is a plan:

Attempt #1: will try to get the hole(s) to be a snug fit for the 6mm pin I've got as a spare part.

If that doesn't work,

Attempt #2 I've had the kind offer of loan of a 6.35mm reamer. I have some 6.35mm silver steel bar (on the desk as I type, as it happens). so will ream out to 6.35mm (I think I've got a 6.1 or 6.2 good quality jobber drill somewhere). The only issue with that is cutting the bar to length and drilling it for split pins (and washers, but if I can achieve that it's probably the best solution.

I daren't go bigger because of the location of the holes, but that should work. I need a good day to do it too, and life is busy presently, so may be a week or two.

Appreciate all the ideas - wouldn't have thought of opening it out to 6.3mm on my own (brain fugs too easily!).

 

[AES]

Sounds good, EtV, although IMO you don't have to go to the trouble of drilling for split pin retainer/s.

You CAN thread the end of your silver steel rod (I've done it, but it IS difficult) but unless there's a lot of sideways movement, which I doubt, "good" retention is not necessary. Why not try to get hold of 1 (or 2 if 1 on each end is needed) of those "top hat" shaped "internal spring washer thingies" that you see retaining the wheels on stuff like shopping trolleys, prams, kids toys, etc? Sorry I don't know what they're called officially, but I guess you know the things that I mean?

HTH

AES

 

[seaco]

I think if I was doing this and wanted to keep to original specs then I'd measure where the holes are in relation on the part then I would TIG weld the holes over and drill and ream them afresh.