RPF PREMIUM MEMBER
I would like to get some input on the two tube four hole shaft -
1. Markus believes the two tubes are 7mm OD - any objections?
2. Any opinions on the four hole sizes?
I'll start by pointing out that there are 6 holes evenly spaced around the perimeter of the shaft part. You can see 3 holes at any one time looking at any of the reference photos from a variety of angles which you wouldn't be able to if there were only 4 holes total. The 6 holes are distributed around the shaft part in 60° increments, while the two tubes are spaced 90° from each other, with the right hand tube aligning with the location of one of the holes and the left tube falling 30° past the next hole to the left. Geez, this is confusing to type out... Let me know if this doesn't make sense.
For dimensions, here's what I got from my perspective matched modeling and scaling work:
1. Tubes - OD 6.35 mm, ID 3.44 mm
2. Holes - 2.57 mm in diameter
I would think finding standard drill bit and round bar stock sizes that are within the margin of error of these numbers would be reasonable.
And in case you want some more data from the model, here are a couple other measurements.
- Length of the shaft that stick out from the split clamp: about 31.9 mm
- Length of the two tubes that stick out from the shaft part: about 7.5 mm
- Location on the shaft part of the centre of the two tubes: about 6.3 mm from the top of the shaft part
- Location on the shaft part of the centre of the four holes: about 18 mm from the top of the shaft part
For the split clamp, modifying OdiWan72's dimensions to fit the perspective matching a little tighter (excuse the crude mark up, but it should convey the info clear enough):