- Joined
- Jan 3, 2013
- Messages
- 8
Ron, no I don't have CAD or any detailed drawings. I have the IH Shop and Operators manuals, plus some Sales literature. Using the overall dimensional data, I made full-size images that were used for construction. I did have a day with a real one to gather measurements for miscellaneous items and detailed pictures, and also pictures from the Internet. Much was self-contained info: I work for a heavy equipment distributor that sold these and was a technical trainer on them for many years. Plenty of field experience.
Some parts were modified in size (ex: the frame) based on readily avaialable material. Original was an I-beam. Could not find one that was close enough and I did not have the confidence or experience to try milling them. So channel was used - overall dimensions are just about right. Of course the web thickness is off but that allowed tapping holes for mounting. The 1:1 was all welded.
I've chosen to walk a line between a scale and a close-to-scale model, knowing that this will be a working truck, actually hauling and dumping dirt, and reliability is high on my want-list. Some components are not actual scale reproductions, again, based on available components. An example is the hydraulic hoses. Available is 4 mm diameter; really should be about 3 mm. The difference of 1 mm does not sound like much, but it is 25% too large. The springs are another item. I used .028" spring steel that scales up to less than a half inch. To be scale it should be 1-1/2" thick. While the spring stacks contain the correct number of leaves, the spacer between the main and helpers at the rear is about 10 times what it should be to make the spacing work. Driveshafts are way too large diameter because I wanted to use u-joints from RC trucks. I can put a list of major parts used together but will wait until it is closer to finished.
All that said, I'm happy with the way it is turning out. Most of the exterior is very close to scale and I think the overall stance and appearance is a good representation of the real truck.
Ken
Some parts were modified in size (ex: the frame) based on readily avaialable material. Original was an I-beam. Could not find one that was close enough and I did not have the confidence or experience to try milling them. So channel was used - overall dimensions are just about right. Of course the web thickness is off but that allowed tapping holes for mounting. The 1:1 was all welded.
I've chosen to walk a line between a scale and a close-to-scale model, knowing that this will be a working truck, actually hauling and dumping dirt, and reliability is high on my want-list. Some components are not actual scale reproductions, again, based on available components. An example is the hydraulic hoses. Available is 4 mm diameter; really should be about 3 mm. The difference of 1 mm does not sound like much, but it is 25% too large. The springs are another item. I used .028" spring steel that scales up to less than a half inch. To be scale it should be 1-1/2" thick. While the spring stacks contain the correct number of leaves, the spacer between the main and helpers at the rear is about 10 times what it should be to make the spacing work. Driveshafts are way too large diameter because I wanted to use u-joints from RC trucks. I can put a list of major parts used together but will wait until it is closer to finished.
All that said, I'm happy with the way it is turning out. Most of the exterior is very close to scale and I think the overall stance and appearance is a good representation of the real truck.
Ken
