Is this for the same purpose? A school, iirc?[if not, just ignore my failing memory....
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You have demanding customers.![]()
I would bore the 2mm then go right in with the 5mm after using a spot drill (or centre drill) to make sure the 5mm is on point.
I tried that on a previous project, drilling a 5mm hole for the key & drilling a 20mm hole for the shaft. The keyway hole caused the large hole to wander off centre!
I didn't have a lathe at the time but I should have bored the large hole instead.
If doing it again could you first drill a center hole in a sacrificial base plate, and then use this with a pilot drill to center align and keep aligned the hole saw?
I was using a 20mm drill bit, not a hole saw!
I can imagine that happening with a big drill unless you had a very rigid pillar drill and clamped the work down tight.I tried that on a previous project, drilling a 5mm hole for the key & drilling a 20mm hole for the shaft. The keyway hole caused the large hole to wander off centre!
I didn't have a lathe at the time but I should have bored the large hole instead.
In the good old days when I just had very basic tools I would bore a hole the size of the key at the correct position and then bore out the centre hole afterwards thus leaving a half round keyway that could then be filed out square.
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Added these magnetic tool holders to a spare bit of OSB I fitted to my parents garage. Helps to keep a few bits and pieces easier to access rather than all crammed in a cabinet.
The only problem with magnets is they pick up swarf, sharps and blades like, well, like a magnet.
As will all of the tools.
I prefer the car in the garage then I'll grind on the drive.