mtt.tr
Member
- Messages
- 8,462
- Location
- Essex/Suffolk border
In your case yes
- Thread starter Parm
- Start date
Oversize drilled holes can also be caused by the drill bit being sharpened unevenly.
Pete.
Member
- Messages
- 14,868
- Location
- Kent, UK
Very true and probably the most common cause.
Other Daniel
Member
- Messages
- 884
- Location
- France, Charente
Just a reminder people, that Parm just wanted to true it up
"enough". I didn't get the impression that he was into hunting
down errant microns.
"enough". I didn't get the impression that he was into hunting
down errant microns.
pressbrake1
Member
- Messages
- 5,719
- Location
- Essex
Which is very useful on occasion
MattF
Forum Supporter
- Messages
- 17,659
- Location
- South Yorkshire
Just a reminder people, that Parm just wanted to true it up
"enough". I didn't get the impression that he was into hunting
down errant microns.
An advice thread going overboard?
Parm
Respect The Sound System
- Messages
- 18,009
- Location
- Towcester
It’s not just oversize holes, the hole is at an angle
Parm
Respect The Sound System
- Messages
- 18,009
- Location
- Towcester
That’s made me chuckleJust a reminder people, that Parm just wanted to true it up
"enough". I didn't get the impression that he was into hunting
down errant microns.
Parm
Respect The Sound System
- Messages
- 18,009
- Location
- Towcester
Pete.
Member
- Messages
- 14,868
- Location
- Kent, UK
prepman
Forum Supporter
- Messages
- 2,763
- Location
- Gwynedd UK
Oh, so, so, true.
prepman
Forum Supporter
- Messages
- 2,763
- Location
- Gwynedd UK
By angle do mean to the centre axis or just meandering? As you quiet rightly say theorectially it shouldn't happen. Drilling oversize is possible with a good size drill, unless your using a small drill and it's flexing a bit like Dynarod. They drill for oil that way. Saddam was stealing it from Kuwait (one place I haven't worked in) by drilling horizontally. That's possible. Cheap drill and not centred from the off. My cheapo Chinese drills are very much a mixed bag. Had some centre drills where the chamfer had been ground in reverse. Trying to explain to the seller was like Basil and Manuel. But not sure which one of us was Manuel in the end.I am struggling to get my head around how a hole can be drilled at an angle on a lathe when it's the workpiece that's rotating. Tapered I can understand, but angled? Is there some secret 4th axis you've not mentioned?
Some hadn't been hardened.....etc.
Last edited:
Pete.
Member
- Messages
- 14,868
- Location
- Kent, UK
I am struggling to get my head around how a hole can be drilled at an angle on a lathe when it's the workpiece that's rotating. Tapered I can understand, but angled
It certainly can happen and is more likely than not if you're using a twist drill to drill deep holes. Once they strat cutting to one side you end up with a banana-shaped hole.
Other Daniel
Member
- Messages
- 884
- Location
- France, Charente
I don't think this is the problem that Parm is experiencing.
Parm
Respect The Sound System
- Messages
- 18,009
- Location
- Towcester
True
But my other and most serious problem is lack of competency in engineering
I could be better but I’ve only just discovered you tube ......
Pete.
Member
- Messages
- 14,868
- Location
- Kent, UK
Seems not but there's no other way to drill an out of straight hole in a part turning on axis. Not one I can think of anyway.
Parm
Respect The Sound System
- Messages
- 18,009
- Location
- Towcester
Always, that’s out too now that I know what I’m doing
don't you want that to go down in engineering history as the "Parm taper", you could be up there with Jacobs or Morse
