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| Enlarging Holes in Thick Plate |
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| awemawson:
Yes Dave that's what I'm now going to do, now Starrett tell me their 25mm saws are actually 1" :scratch: I'll make a guide by cutting a hole in a thick bit of plate and clamp it in place as I originally intended but was initially thwarted by the apparent lack of 1" saws :bang: |
| RotarySMP:
Comparing the hole producted by a 1" hole cutter in a hand drill, to line boring: Line boring: + accurate size to whatever tolerance you want especially if you make guide bushings for the existing holes, + round holes + both holes concentric / aligned. + in the correct place (assuming the existing holes are reasonably round and in the correct place). + more controllable, adustable process, + safer for the operator. Only torque to be reacted. - Have to make up the long boring shaft, at least one guide bushing, probably three, if you use a piece of 20mm or 3/4" stock for the boring bar. Hole cutter (hand held drill, unpiloted - guided by 1/2 plate): - no control of diameter. Starrett knows a thing or two about metrology, and considers a 25mm and inch hole made with these things as equivelent. That is a strong hint. - no control of alignment between two sides. - terrible surface finish in holes - more danger to operator if it grabs - have to make the 1/2' guide plate. Regards, Mark |
| awemawson:
The job doesn't justify line boring, and also that would be very difficult to arrange 'in the field' although specialist kit is available to do it. If this was the sockets for rotating pins on, for instance, a back hoe then yes. However in this situation it's the hole saw - horses for courses. Actually I was surprised how good the surface finish was on my test samples, but obviously not as good a boring |
| bertie_bassett:
last time i had to do something similar, i found a nice solid fallen tree branch and hammerd it in the origional hole as a plug. i then just used my normal hole cutter with pilot, centerd as best i could. worked fine for me and got me out of trouble when all the shops were shut and i was miles from a workshop. |
| awemawson:
Well the Starrett hole saw arrived today so I set to and enlarged the holes: First clear the nettles, brambles and other detritus that I'd otherwise have to roll around in - I also hauled the huge hydraulic pump out of the way. |
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