VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 04-11-2019, 02:05 AM
Draker's Avatar
Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 576
Default Oh snap!

Rest In Peace, my 0.311" reamer!



That got my heart going when this thing loudly snapped in half. This unfortunate tool met its end while reaming the -7A gear mount holes for the main gear legs. Thanks to great luck, it did not damage the workpiece while breaking. I've learned here that when a tool breaks it's usually not a bad tool but bad technique. Anyone have any tips for properly and safely using these very large reamers? I would like to not repeat this one.
__________________
Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2020
RV-7A (N12VD): Finishing final tasks for engine-start and airworthiness!
Reply With Quote
  #2  
Old 04-11-2019, 03:33 AM
GeoffP's Avatar
GeoffP GeoffP is offline
 
Join Date: Sep 2018
Location: NSW, Australia
Posts: 224
Default My 2 cents worth

Don?t push too hard, or you could bend the tool & then it?ll snap. Ensure you?re dead in line with the hole (or in this case it would?ve been holes?), bit of lube on the reamer. Apply even pressure, and let the reamer do the cutting
__________________
RV-9, Empennage and Wings about done, Fuselage taking shape.
Reply With Quote
  #3  
Old 04-11-2019, 04:59 AM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,606
Default

To emphasize a point in the first reply, I always get better results using cutting fluid and using minimal pressure. You usually can get a sense of when the tool may be binding - when this happens, back off a bit and check alignment.
__________________
Turner Billingsley

RV-14A built/sold N14VB
RV-12iS in progress as of October 2020
Reply With Quote
  #4  
Old 04-11-2019, 05:16 AM
rzbill's Avatar
rzbill rzbill is offline
 
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,752
Default

They don't work for everybody. I broke 2 before taking the gear to have the tapers wire EDM'ed.

*Edit* Ignore the above please. I thought it was a taper reamer being discussed. Obviously not fully awake at the moment.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.

Last edited by rzbill : 04-11-2019 at 06:13 PM.
Reply With Quote
  #5  
Old 04-11-2019, 07:20 AM
rapid_ascent rapid_ascent is online now
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,624
Default

Ryan,

You shouldn?t be removing too much material with the reamer. Just take it slow. I would use lower rpm too.

Ray
__________________
Ray Tonks
2022 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
Reply With Quote
  #6  
Old 04-11-2019, 12:49 PM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
 
Join Date: Jul 2013
Location: US
Posts: 2,528
Default

I don't know if this is right or wrong, or applicable or not, but IIRC a few folks a while back advocated for pulling the reamer through the hole, rather than pushing.

More experienced folks may want to weigh in here...
__________________
2019 Dues paid!
Reply With Quote
  #7  
Old 04-11-2019, 12:59 PM
terrye terrye is offline
 
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 962
Default Oh snap!

The gear legs are heat treated as are the bolt holes at the top of the gear legs and therefore almost as hard as a reamer or drill. I similarly broke a twist drill while enlarging the hole at the top of the gear leg. The suggestion of "pulling" the reamer through the hole will allow the reamer to be aligned with the hole better than "pushing". Cutting oil will help. Using a very slow speed will help.
__________________
Terry Edwards
RV-9A (Fuselage)
2021/2022 VAF Contribution Sent
Reply With Quote
  #8  
Old 04-11-2019, 07:55 PM
Draker's Avatar
Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 576
Default

"Pull" rather than push sounds interesting but how would that work when the tool will not yet pass through the holes? For example, prior to reaming, I believe the -7A gear weldments come from Vans drilled to 9/32".
__________________
Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2020
RV-7A (N12VD): Finishing final tasks for engine-start and airworthiness!
Reply With Quote
  #9  
Old 04-11-2019, 08:50 PM
rapid_ascent rapid_ascent is online now
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,624
Default

I was wondering about that too.
__________________
Ray Tonks
2022 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
Reply With Quote
  #10  
Old 04-12-2019, 12:24 AM
Tommy123 Tommy123 is offline
 
Join Date: Jul 2018
Location: Naples fl
Posts: 140
Default

When reaming a close tolerance hole a drill bushing should be used for all stages. Step reaming is also a good idea especially with hardened steel.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 01:10 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.