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I posted an image several days ago in Machine Modifications to show my modified George Thomas Versatile Dividing Head. I should have posted that picture in the Boo Boo section. The image showed drilling and milling the starting rod holes in the flywheel of my model Cat Sixty crawler tractor...

I really admire the designs of George Thomas, having made most of them over the years. Castings are available for his versatile dividing head and universal pillar tool. They, like all of his designs are suited for smaller workshop equipment, particularly the Myford series 7 lathe. When...

Here are two shots of my model Caterpillar Sixty from the rear and top. The seat is removed to access the clutch linkage so I can adjust the relationship between engine and clutch. In the top view are the steering brake and clutch linkages for either tracks. The hardest part to make was the...

Here’s a work in progress picture of test fitting a Seal Major engine in a model of a Caterpillar Sixty crawler tractor. This is not the final engine but an interim power plant to test the operation of the controls and transmission in the Cat. Now I know the relationship between engine and...

I’m building a gear pump to circulate coolant on my Seal Major engine model. I wasn’t happy with the centrifugal pump I originally made. I found several formulae on line to calculate the flow rate given the size of the gears and the speed of rotation. Has anyone built a gear pump and...

I suppose we could argue that this is a machine. It’s certainly modified. This isn’t something I’ve owned for ages and modified over the years, I just bought this a month ago with the full intention of making the changes. It’s a Milwaukee portable bandsaw, corded model and the separate stand...

One of the sections which drew me to this site was the section on Machine Modifications. That’s a particular interest of mine (in addition to building working models), making and modifying tools. This picture might be of interest to those who can't leave machines stock.. This is my main lathe...

There's been some interest in this model in comments. I haven't any detail shots of the Holt style Cat engine, the best images are some overall shots I took outdoors. Most of the pictures I take are of machine setups and special tooling. Here's three Cat Sixty pictures, this engine...

Thanks for the welcome messages I received after becoming a member yesterday. I mentioned in my introduction that I was currently working on a Seal Major IC engine. What I forgot to mention was that I also have another model under way at the moment, here's a picture of the other model, a...

New to this forum. I've been building steam and IC engine models for over 40 years. My IC engine models are all ETW designs, the Road Roller and the 1831 shunting locomotive - both of these have alternate transmissions, the roller has the full size 4 speed twin clutch transmission and the...