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New wheels, tires, axles and brakes for my Mark II

 
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cristalclear13



Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia

PostPosted: Wed Jun 06, 2012 6:38 am    Post subject: New wheels, tires, axles and brakes for my Mark II Reply with quote

Tracy O'Brien has sent my new wheels, tires, axles and brakes.

When cutting the hole in the axle to line up with my leg strut, how do I get the right angle for the tire so that the wheels are angled right? The old axle had an "8"-shaped cut in it where it looks like they tried it in one position and had to redrill to readjust it. I'd rather not have to do that.


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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009
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williamtsullivan(at)att.n
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PostPosted: Wed Jun 06, 2012 7:54 am    Post subject: New wheels, tires, axles and brakes for my Mark II Reply with quote

I think Jack Hart has something on his web site about it. I would drill for the axle first, then clamp some vice grips around the gear so it can't go in too far. Then you can rotate it until you get the correct alignment, drill half way from one side, and through from the other. Or just start the hole from each side, pull it, and use a drill press.

--- On Wed, 6/6/12, cristalclear13 <cristalclearwaters(at)gmail.com> wrote:
[quote]
From: cristalclear13 <cristalclearwaters(at)gmail.com>
Subject: New wheels, tires, axles and brakes for my Mark II
To: kolb-list(at)matronics.com
Date: Wednesday, June 6, 2012, 10:38 AM

--> Kolb-List message posted by: "cristalclear13" <[url=/mc/compose?to=cristalclearwaters(at)gmail.com]cristalclearwaters(at)gmail.com[/url]>

Tracy O'Brien has sent my new wheels, tires, axles and brakes.

When cutting the hole in the axle to line up with my leg strut, how do I get the right angle for the tire so that the wheels are angled right?  The old axle had an "8"-shaped cut in it where it looks like they tried it in one position and had to redrill to readjust it. I'd rather not have to do that.

--------
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009


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byoungplumbing(at)gmail.c
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PostPosted: Wed Jun 06, 2012 8:45 am    Post subject: New wheels, tires, axles and brakes for my Mark II Reply with quote

Tracy O'Brien has sent my new wheels, tires, axles and brakes.

When cutting the hole in the axle to line up with my leg strut, how do I get the right angle for the tire so that the wheels are angled right? The old axle had an "8"-shaped cut in it where it looks like they tried it in one position and had to redrill to readjust it. I'd rather not have to do that.

--------
Cristal Waters
Quote:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

guess I am not exactly sure how the axel fits to the leg strut... a photo of what needs drilling may help.

that said.... if I were to start again. I think I would take a straight (I mean very straight) 2x4 and strap it to the wheels with a ratcheting tie down before installing tires. have the wheels and axels attached to the plane and have the weight of the plane on the wheels installed on grease plates on the floor, the 2x4 should be elevated to the same height off the floor as the axel. that should put the wheels in parallel alignment, if you want a bit of toe in, put a small shim between the 2x4 and the outside lip of the wheel. assuming the inside lip and outside lip are 5.75 inches, center to center. and you want 1 deg of toe in. take 1 deg divide by 10 then divide by 2 and that is the thickness of the shim. on each outside rim surface, between the rim and the 2x4. see attachment. the amount of toe in is dependent on the flexability of the landing gear. the more rigid the gear the less toe in, on my mkIII I have the tapered steel legs that I got from kolb and I ended up with 1.22 deg toe in. also I found the more air pressure in the tires and the harder the runway surface,, the more exact the toe in needs to be to drive straight..

a grease plate is made by putting some grease between two pieces of aluminum plate, the wheels on the grease plates should be able to slide side to side, for and aft and twist freely.
in a pinch I have used some 1/8 inch floor tiles. but they are fragile. to keep from denting the alum grease plates, it could be set under a piece of plywood.

hope this helps
boyd y
mkiii utah

instead of a 2x4 you may be straighter if you use an 1 1/2 inch aluminum angle or straight angle iron.


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