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04-11-2019, 01:05 AM
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Join Date: Jun 2016
Location: Livermore, CA
Posts: 397
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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.
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Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/16/2019
RV-7A (N12VD): Empennage and wing kits complete minus fiberglass, fuselage and wiring complete. Canopy complete minus fiberglass. Waiting for the engine to come!
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04-11-2019, 02:33 AM
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Join Date: Sep 2018
Location: NSW, Australia
Posts: 156
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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
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RV-9, Tail Feathers done, Wings almost done.
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04-11-2019, 03:59 AM
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Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,471
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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.
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04-11-2019, 04:16 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,690
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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.
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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 05:13 PM.
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04-11-2019, 06:20 AM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,259
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Ryan,
You shouldn?t be removing too much material with the reamer. Just take it slow. I would use lower rpm too.
Ray
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Ray Tonks
2020 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
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04-11-2019, 11:49 AM
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Join Date: Jul 2013
Location: US
Posts: 2,245
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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...
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2019 Dues paid!
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04-11-2019, 11:59 AM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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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.
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Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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04-11-2019, 06:55 PM
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Join Date: Jun 2016
Location: Livermore, CA
Posts: 397
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"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".
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Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/16/2019
RV-7A (N12VD): Empennage and wing kits complete minus fiberglass, fuselage and wiring complete. Canopy complete minus fiberglass. Waiting for the engine to come!
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04-11-2019, 07:50 PM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,259
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I was wondering about that too.
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Ray Tonks
2020 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
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04-11-2019, 11:24 PM
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Join Date: Jul 2018
Location: Naples fl
Posts: 140
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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.
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