Bolt Selection thickness

[grain_r]

Hey Guys

Thank you very much for the replies and I am sorry I haven't updated the thread it didn't let me know that anyone had replied for some reason.
The image below is what I am trying to bolt together.
I have used a 4.2mm Cobalt drill and then used a 5mm tap in the pillar drill and started it to keep the tap straight and then finished it off by hand although the threads aren't very good at all on two of the holes it has only got 1 thread fully around and hardly any on half of the hole which I guess must be an oval hole or something. I'm just not getting the result I should be the main issue seems to be the drill wanderd around using the pillar drill. I have used a big centre punch and then even started with a step drill of 4mm and then swapped to the 4.2 I have even turned the drill by hand and drilled the starter hole before turning the drill on and that doesn't seem great either.

I guess it's most likely the pillar drill that's not up to the job the sad truth is I think I will get a better job using my dewalt hand drill. It is a Kinzo pillar drill so a cheapo unit but I would have thought I should be able to get a hole really maybe its the monkey that's using it blaming his tools



I have my Build thread which has more images on too

http://www.mycncuk.com/threads/7936-...-few-questions

Thanks

Rob