|
-
POSTING RULES
-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|
10-11-2020, 01:16 PM
|
|
|
|
Join Date: Oct 2009
Location: Houston
Posts: 64
|
|
Drill press & straight holes
I've ruined two WD-409 parts. I'm one to practice drilling a new hole vertically thru the mani body. I've gotten the part about finding the center line and clamping figured out but now when I try to drill through the bottom the holes wander all over.
The hole with the black mark next to it illustrates the issue. The top is dead on the center line and good. Drilling through to the bottom gies me whacky holes all off the center line.
How can I maintain the drill along a vertical line while drilling through the tube?
__________________
Mark Jackson
Houston, TX
RV-8 in progress/Mooney in the hangar.
|
10-11-2020, 01:18 PM
|
|
|
|
Join Date: Dec 2009
Location: Savannah, GA
Posts: 88
|
|
Spot drill
Have you tried a spot drill bit to mark the hole?
And I might be wrong, but I would think drilling thru is not the right approach. I would think I would flip the part over and drill the other side,,, but maybe someone knows better than me.
Last edited by R7237 : 10-11-2020 at 01:25 PM.
|
10-11-2020, 01:34 PM
|
|
|
|
Join Date: Oct 2012
Location: LA, California
Posts: 320
|
|
Wrap a piece of paper around the tube with tape so you can mark accurate holes on both sides. Center punch the holes and drill #30 or so. Then though drill the hole a little larger. I always drill undersize and ream to final size for the best bolt fit.
Ed Holyoke
|
10-11-2020, 02:33 PM
|
 |
|
|
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
|
|
Drill tube
Quote:
Originally Posted by Bicyclops
Wrap a piece of paper around the tube with tape so you can mark accurate holes on both sides. Center punch the holes and drill #30 or so. Then though drill the hole a little larger. I always drill undersize and ream to final size for the best bolt fit.
Ed Holyoke
|
That works. I also use a V-block. Pretty handy device for all sorts of drilling. I use it a lot. The block can be flipped around.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
|
10-11-2020, 02:41 PM
|
 |
|
|
Join Date: Oct 2011
Location: CNV9
Posts: 300
|
|
I used this.
__________________
Eric,
2020 dues paid
RV-8 83274
Emp & SB Wings on fuse, SB Fuselage in progress
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro & EFII Bus Manager & System 32 in progress
Aerosport IO-375 + MTV-9-B/183
Skyview HDX (next)
|
10-11-2020, 03:34 PM
|
 |
|
|
Join Date: Sep 2018
Location: NSW, Australia
Posts: 156
|
|
Drill-guide V-block
https://www.browntool.com/Listview/t...ch=drill+guide
I used this when match-drilling aileron push tubes, and it worked out great. I clamped the piece(s) to be drilled to the bench, clamped the drill guide on the piece with the hole centred then drilled.
If you're drilling steel, make sure your drill speeds are correct (usually slower than for aluminium) and use lube on the bit.
__________________
RV-9, Tail Feathers done, Wings almost done.
|
10-11-2020, 03:40 PM
|
|
|
|
Join Date: Jul 2012
Location: n. wi
Posts: 774
|
|
i would drill undersize holes on each side. start with a small bit and go up and pay attention to drilling your indent mark as accurate as possible. then finally drill to full size , going in one side and out the other in one pass.
__________________
Bob Noffs
n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 01:22 PM.
|
Linear Mode
