Fordson Super Dexta #1: Rear wheels and tyres.

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Blog entry by Pjonesy posted 07-27-2021 05:15 AM 835 reads 0 times favorited 5 comments Add to Favorites Watch
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Most of us modellers really want our wheels to be as round and accurate as possible so when you show them off the model tracks straight without bucking up and down.
When making almost any tractor tyre I start by marking it out then boring a 1/4’ hole in the middle. Then I cut the outside circle first on my circle cutting jig on the band saw. Next using a sliding table jig with a 1/4’ dowel on my disc sander, the outer edges of all similar sized wheels can be sanded very accurately to the same size.
Cutting the grooves for the treads can be easily done on a table saw. The trick is to get the saw blade to cut a wider groove. This can be achieved by using a shim (in this case a piece of feeler gauge) on one side of the saw blade. Trial and error will get you the right amount of wobble to cut the correct width saw cut. Make sure you use a very sharp blade with plenty of teeth to prevent chipping at the back of the cut. See pictures

Next using a similar jig on the fret saw as the one on the bandsaw, the centre is cut out. (sometimes these can be bored out using a forstner bit etc.) This method very seldom is accurate enough and usually the inner circle is not entirely concentric with the outer circle. to overcome this I use a router to make everything concentric and parallel as per the following picture.

Note you must find the narrowest part of the tyre to start with because the tyre has to be in place before the router is turned on. This means holding the tyre firmly in place against the router and the jigs. Once started you must turn the tyre against the rotation of the router cutter, going the other way is a sure recipe for disaster. Turn off the router before you attempt to remove the tyre.
Next is the wheel rim that is cut out and sanded in the same way to fit snuggly inside the tyre. The inner part of the rim where the wheel sits is bored out using a forstner bit and because it is quite thin and fragile I clamp it inside the tyre onto me drill press to hold it steady as per the next picture. Sorry LBD it came out sideways even though it was correct in my picture file.

Please note; sometimes I use tools in a manner that might be unsafe. I am not recommending that any one use tools in a dangerous manner. I am just showing you how I do it. How you achieve your results is up to you but please always use extreme caution.

-- Don't tell me it can't be done.

5 comments so far

View crowie's profile


4932 posts in 3167 days

#1 posted 07-27-2021 07:02 AM

Fixed Peter.

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View Dutchy's profile


4175 posts in 3384 days

#2 posted 07-27-2021 07:45 AM

Thanks for showing! I like the idea of the inner side routing of the tyres.


View LittleBlackDuck's profile


7924 posts in 2037 days

#3 posted 07-27-2021 08:16 AM

Sorry LBD it came out sideways even though it was correct in my picture file.
- Pjonesy

I can handle people acknowledging that the picture was not 100% OK. It’s when posters seem oblivious to that fact and expect everyone to conform, what gets me uncomfortable.

There are easy and hard ways to fix... just try not to get caught up in the latest thread hype.

Thanks crowie...

BTW. Good hint PJ...

-- If your first cut is too short... Take the second cut from the longer end... LBD

View htl's profile


5564 posts in 2375 days

#4 posted 07-29-2021 11:41 PM

Very interesting tips.
Your wobble blade tip.

Can be done with a Wobble blade that used to be sold at Sears but can be found on Ebay and the like.
It has many other great uses.
Be sure to get one with as many teeth as possible as Pjonesy pointed out.
I’ll bet one would be hard to find in your neck of the woods.

-- An Index Of My Model making Blogs

View LittleBlackDuck's profile


7924 posts in 2037 days

#5 posted 07-30-2021 07:51 AM

I really like the idea of your cutting the perfect round wheel shape of the wood.
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- david0912

“Bazinga” PJ...

-- If your first cut is too short... Take the second cut from the longer end... LBD

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