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Well, what I did was make up a simple Jig to hold and
position the motor mount and inserted legs. I first measure everything
carefully and then connected a piece of angle (steel as best I recall) between
the axels of each leg to ensure they neither rotated in the mount nor
angled out differently. Then it was position this set up over the drill
press, get some cutting oil and start drilling.
Here is one method to hold the gear legs in
position. Mount the gear legs and position them properly. Then cut
out some section of tubing with inside diameter a bit larger than your motor
mount extension. About three small strips long enough to put 3-4 inches on
the mount extension and 3-4 inches on the gear leg. Then take two radiator
hose clamps and clamp the strips to the motor mount extension with the remainder
sticking down over the gear legs. Then using another two clamps on the
legs clamp these three strips to the legs. Make a couple of marks on
extension and legs to ensure you can easily check that alignment is
maintained. I think you will find this clamping pressure will hold the
legs in place provided you don't bang them around. I then put the angle
from axel to axel and using wood blocks to maintain the proper angle between the
angle iron and the axels clamp them together. This will pretty much assure
that the legs will maintain there orientation while you drill.
A piece of angle iron that the leg and mount extension can
bit inside of can be mounted to the drill press to further insure
alignment.
there are many ways to do this - this just the one I came
up with.
Ed
Sent: Saturday, September 04, 2010 5:42 PM
Subject: [FlyRotary] Re: Dimensional help needed
Maybe I’m missing
something, but don’t you have to drill the leg positioned in the mount?
If so, how can you use a drill press?
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Saturday, September 04, 2010 5:23
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dimensional help
needed
Bryan, if you decided to drill your legs,
in addition to a drill press, the drill bit itself is important. I would
not attempt it unless I used a quality colbalt drill bit (not carbide - too
brittle). I would start off with a drill bit undersize but not smaller
than 1/8" perhaps 3/16" (too small and they may wander). Then if you
progressively enlarge the hold with a larger drill bit, you are more likely to
drill a straight hole. You will need to drill at a slow rpm or risk
burning the drill bit and hardening the metal even
more.
If you do not feel comfortable doing
this, then the shipping charges to someone who knows what they are doing is
probably cheap in the long run.
I drilled my own (successfully),
but, only because I could not find anyone at the time to do it for
me{:>)
Sent: Saturday,
September 04, 2010 5:12 PM
Subject:
[FlyRotary] Re: Dimensional help
needed
That’s what I wanted to
do, but Ed K prefers to mount the clips undrilled. This forces me to drill
the legs. But, he is apparently able to use Van’s mount. Did he
charge more for this approach as opposed to his preferred way? I guess
shipping is more costly.
I guess I need to run
it by him again. I haven’t bought any mount, but I really don’t want to
drill my legs.
BW
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bob Perkinson
Sent: Saturday, September 04, 2010 5:02
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dimensional help
needed
The gear legs were straight from Vans. After
having been ripped off by Fred Breeze (Conversion Concepts) I ordered an engine
mount and matching gear legs from Vans and had Ed Klepis convert it. I had
bought a pair from Harman Lang several years ago to be match drill to the CC
mount, but after spending the money and not getting the mount I sold them to
someone in Texas can't now remember. The only
advice that I can relay is that of a machinist friend. Use a good sharp
centering punch and good luck if you don't have a good drill press to mount the
gear leg in.
RV-9 13B
From: Bryan
Winberry <bryanwinberry@bellsouth.net>
To: Rotary motors
in aircraft <flyrotary@lancaironline.net>
Sent: Fri, September 3, 2010 4:38:41
PM
Subject: [FlyRotary] Re:
Dimensional help needed
Bob,
Any tips on drilling
your gear legs?
Thanks,
Bryan
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bob Perkinson
Sent: Friday, September 03, 2010 5:03
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Dimensional help
needed
as you can see in the photo I used a
laser light level to find the distance, but as you probably know the line gets
somewhat thick the father you get from the source. SO you can add or
subtract a 16 th. I got 4" 15/16. Ed Klepis probably has that figure
in his notebook. Let me know what other numbers you come up
with.
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