MetalworkingFun Forum › Machining › Projects v
Todays Project - What did you do today?

Thread Modes
Todays Project - What did you do today?
f350ca Offline
Senior
*****
Posts: 3,003
Threads: 51
Joined: Apr 2012
Location: Ontario
#191
09-18-2012, 07:16 PM
I'd do it in 3 steps Ed. A pilot hole first then 1/32 under the size you want followed by your final bit. If the cutting edges on your drill aren't equal length, (mine never are exact from sharpening) it will drill oversized till its just about to break through, then you'll see the tell tale smaller diameter at the bottom of the hole. If the flanks of the drill are different length or the bit isn't chucked perfectly straight it will still drill oversized till the point is buried in the previous bore.
Free advice is worth exactly what you payed for it.
Greg
Reply
Thanks given by:
EdK Offline
Whipping Boy
*******
Posts: 8,891
Threads: 320
Joined: Feb 2012
Location: Arizona/Minnesota
#192
09-19-2012, 05:52 AM
(09-18-2012, 07:16 PM)f350ca Wrote: I'd do it in 3 steps Ed. A pilot hole first then 1/32 under the size you want followed by your final bit. If the cutting edges on your drill aren't equal length, (mine never are exact from sharpening) it will drill oversized till its just about to break through, then you'll see the tell tale smaller diameter at the bottom of the hole. If the flanks of the drill are different length or the bit isn't chucked perfectly straight it will still drill oversized till the point is buried in the previous bore.

Greg,

That sounds like a reasonable method. I was thinking about how I did it and I did not go up in 1/32" steps as I previously stated. I went up in 1/8" steps until I got close to 1/2" and then used a 7/16" followed by the 1/2". Last evening I finished drilling the hole and used 5/8, 11/16 and then the 3/4" bits. The hole is 3 1/2" deep and the large bits must have flute lengths of about 4" because there wasn't much of the flutes showing when I broke through. Those big bits are scary.

Ed
Reply
Thanks given by:
dallen Offline
Senior
*****
Posts: 1,827
Threads: 51
Joined: Apr 2012
Location: Oklahoma
#193
09-19-2012, 09:38 AM
I drilled a hole in a piece of 1" plate last night started with a 3/8 inch center drill, then a 5/16 inch bit then a 5/8 then, finished it out so I could get a 3/4 inch boring in the hole with a 1" S&D Bit then bored it out to tap drill size for a 1.5 X 16TPI thread. Used a hand sharpened 3/8" HSS threading bit in a 1" boring bar for stiffness due to having to have the bit hanging out in the wind about 6 inches (had to keep carriage away for the one jaw that was sticking out of the chuck.

yep I know I probably did it wrong but I had the hunk of flat bar off center by about 2 inches.
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.

If life seems normal, your not going fast enough! Tongue
Reply
Thanks given by:
f350ca Offline
Senior
*****
Posts: 3,003
Threads: 51
Joined: Apr 2012
Location: Ontario
#194
09-19-2012, 09:51 AM
Dallen,if it worked and there were no casualties then you didn't do it wrong.
Free advice is worth exactly what you payed for it.
Greg
Reply
Thanks given by:
ETC57 Offline
Junior
****
Posts: 576
Threads: 18
Joined: Feb 2012
Location: Washington State USA
#195
09-19-2012, 09:51 AM
So Dallen,
I thought it's only wrong if it doesn't work!Rotfl

Jerry.Popcorn
ETC57, proud to be a member of MetalworkingFun Forum since Feb 2012.
Reply
Thanks given by:
Rickabilly Offline
Junior
****
Posts: 537
Threads: 15
Joined: Jun 2012
Location: Cambridge, England
#196
09-19-2012, 10:55 AM
When working in a machine shop, all sins are easily forgiven, as long as the part turns out OK that is, but, even if you work to every best practice standard on earth if the part turns out wrong that's a whole other story, and no-one ever forgets about it either.

Rick
Whatever it is, do it today, Tomorrow may not be an option and regret outlasts fatigue.
Reply
Thanks given by:
dallen Offline
Senior
*****
Posts: 1,827
Threads: 51
Joined: Apr 2012
Location: Oklahoma
#197
09-19-2012, 11:35 AM
(09-19-2012, 10:55 AM)Rickabilly Wrote: and no-one ever forgets about it either.

Rick

ain't that for sure, specially my exwifeSweatSweat
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.

If life seems normal, your not going fast enough! Tongue
Reply
Thanks given by:
f350ca Offline
Senior
*****
Posts: 3,003
Threads: 51
Joined: Apr 2012
Location: Ontario
#198
09-19-2012, 08:16 PM
First project with lumber off the sawmill, actually poplar that blew down on the property. A drying shed for the hardwood we're producing.

[Image: IMG_0197.jpg]
Free advice is worth exactly what you payed for it.
Greg
Reply
Thanks given by:
SnailPowered Offline
Junior
****
Posts: 258
Threads: 13
Joined: Aug 2012
Location: USA
#199
09-19-2012, 11:46 PM
NICE! That is simply awesome!!
SnailPowered, proud to be a member of MetalworkingFun since Aug 2012.
Reply
Thanks given by:
TomG Offline
Alt. Whipping Boy
*******
Posts: 3,799
Threads: 184
Joined: Jun 2012
Location: Farmington Hills, Michigan
#200
09-20-2012, 06:41 AM
Looking good Greg.

What type of mill are you using? Is it a commercial unit or one that you built?

Tom
[Image: TomsTechLogo-Profile.png]
Reply
Thanks given by:




Users browsing this thread: 67 Guest(s)