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| Buuilding a Grasshopper |
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| raynerd:
Lovely work! |
| Meldonmech:
Hi Chris Thanks for the comments. Cheers David |
| Meldonmech:
Hi Guys The next job on the agenda are the frame pillars, and these need some special tools to be ground. The first pic. shows these tools, the most difficult to grind is the outside form tool, which needs both front and side rake. These angles must be made at the same time maintaining the profile. A piece of silver steel is used to check the form. A bar of brass was faced up each end to the correct length. The 1/4 inch dia. spigots where turned, center drilled and tapped. The collet chuck was set up in the lathe and the work piece held, by the chuck and tailstock center. The position of the fancy turnings was marked out, then cut with the form tools. The top slide was then set to the required angle and the taper turned. The pillar was then reversed and the opposite taper turned. Finally the form tool was used to produce the radius at each end. Cheer David |
| Meldonmech:
Hi Guys Finally got round to machining the feet. The brass bar was cut into four near finished size lengths to save material. The bar was then faced, drilled and tapped 2BA. The job was then reversed and the top diameter turned. This was used as a spigot, and held in the lathe collet chuck. The taper was turned, and radius on the rim turned by hand using a specially ground tool. Next a mandrel was made and attached to the base of the foot using a 2BA screw. This enabled the radius on the top rim to be completed. The top of the foot was then drilled and tapped 12BA. At a glance I thought this looked quite a simple straight forward job, and was surprised how involved it was to make four feet all exactly the same. Cheers David |
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