Photos and info on 1/8th scale model 5130 #3: Idler sprockets etc.

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Blog entry by hookfoot posted 11-03-2019 10:54 PM 361 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 2: Body chassie and track frames Part 3 of Photos and info on 1/8th scale model 5130 series Part 4: Bearings for the turn table »

After I posted the last blog I found a photo that should have been there. It has a lot more pieces and explains a lot more.

This shows a little more on the chassie and track frames also.
This is the jig(not fancy) for sizing the width if the track pad. The cross bar under the pad is the runner the track links fit in.
These are the large idler wheel blanks. They are 1 1/2in by 61/2in.
The bar that is screwed on is the handle that i use to turn the blank to shape it. You will have to stick with me as I try to explain how I make them. I have a lathe but I am not very good with it. I make my idler wheels on a jig that screws on the face of the router base after the face plate is taken of. I made a band around the head of my router(clamped to the router) which in turm clampes to my bench. I never made myself a router table. I would sooner be working on my models/toys. The blanks are pre drilled for the axle size(3/8in.). My wheel jig has a 3/8in post for the blanks to mount on. This part is in a slot so I can adjust/move the blanks. I use 1 14 straight spiral bit to cut away what I do not need. I size the wheels first. Readjust and cut the outer ring(for track alignment). Readjust and cut away the waste in the flange area of the wheel. To do this i plunge cut into the blank and using the handle bar I can turn the blank adjusting in or out which ever I need to get all the material cut away. The screws that hold the turning handle in place are in material next the axle hole that stays. You do not see the hole when it is all together. As i was just reading what I have typed I realized s mistake in my story. Two of the blanks were idler wheels and two were drive(toothed) wheels. The first two did not work right so I tried something different. No shame to make a mistake. Admit it and move on. The drive wheel is held on by a 3/8th in. nut that is under the cover plate that is held on by the 24 #2 by 3/pan head wood screws. All those screws are for the bolts that hold the real cover plate on.

Here are a couple of my shop buddies.

The one did stay very long. The cold whether was getting to the praying mantis so I took him in the shop. I gave him water and tried to feed him some dead flies. He lived about ten days. I still have his body laying on one of my window ledges.

Back to the drive wheels. To make the sprocket I plotted the holes that made the bottom of the teeth. Drilled them. I cut away the excess wood to the outside of the holes, then mounted it on a jig on by sanding wheel so I could get the final circumference of the drive wheel by turning the blank as I moved in on the sanding wheel. I beveled the outer edge of the drive wheel with my random orbiting sander by eye.I

I most likely have you all shaking your head and wondering what I am doing. As I said when I started this blog I never read the chapter in the book of all those things you are not suppose to do. I have had a few minor bo bos but I still have all my fingers. My wood shop keeps the gremlins away from me most of the times. Have fun and enjoy.

3 comments so far

View crowie's profile


3276 posts in 2486 days

#1 posted 11-03-2019 11:41 PM

All I can do is shake my head in wonder at the scale of the model.
Absolutely amazing sir.

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

View Redoak49's profile


4232 posts in 2524 days

#2 posted 11-04-2019 12:22 PM

It is always interesting to see how people solve the problem of making something. Those wheels are excellent.

View htl's profile


4844 posts in 1695 days

#3 posted 11-11-2019 07:02 PM

Been sick so have gotten behind this thread but love the work and am enjoys seeing models built from this larger scale.
I’ve been building at the toys and joys scale [what ever that is] so long it would really take me a ton a rethinking to build at your model scale but love to see how you go about solving all the problems, which I must say is the whole fun of building these models.
Keep up the great work and love the blogs!!!

-- An Index Of My Model making Blogs

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