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The 6.5 might be a little too large, 1/4” drill might have been a better size.
It doesn’t really matter what diameter the small cone size is, the largest size and angle is more critical.
The largest size need to be bigger than the diameter of the largest size tube you need to turn.
Ideally 45 to 60 degrees angle works best.
It doesn’t really matter what diameter the small cone size is, the largest size and angle is more critical.
The largest size need to be bigger than the diameter of the largest size tube you need to turn.
Ideally 45 to 60 degrees angle works best.
Oh dear,
Mine look a lot different to those
They seem to be a snug fit and have no lateral movement yet when I measured the mandrel it did come in at 6.2 so I just assumed my Vernier's were out a little, would 0.3mm make that much difference?
Here is what I turned, I think it was not my finest moment doing these
It says it’s 6.2mm. Plastic can be funny stuff to machine sometimes and drilled holes can close up a bit.
If I was making them and had a good selection of drill bits I’d try a 6.2mm drill first and see if the mandrel fitted. If not I’d go up in steps until I got a good fit. I think originally the idea of these Mandrels was for them to fit a 1/4” hole, (6.35mm). Mandrels seem to vary from a reported 6.18mm up to 6.25mm in diameter though.
I’m not sure how much work is involved or how effective the result was but I did read of folks in the US buying 1/4” ground rod for a mandrel and carefully sanding it down until the bushes fit.
I don’t intend to make slimlines so I actually bought a piece of 7mm ground silver steel rod for a mandrel together with a 6.9 drill bit and a 7mm reamer. Any bushes I need to use are easily drilled and reamed to fit my 7mm mandrel. I’m fortunate enough though to have a metal lathe although it could be done on a wood lathe if you have a collet Chuck.
If I was making them and had a good selection of drill bits I’d try a 6.2mm drill first and see if the mandrel fitted. If not I’d go up in steps until I got a good fit. I think originally the idea of these Mandrels was for them to fit a 1/4” hole, (6.35mm). Mandrels seem to vary from a reported 6.18mm up to 6.25mm in diameter though.
I’m not sure how much work is involved or how effective the result was but I did read of folks in the US buying 1/4” ground rod for a mandrel and carefully sanding it down until the bushes fit.
I don’t intend to make slimlines so I actually bought a piece of 7mm ground silver steel rod for a mandrel together with a 6.9 drill bit and a 7mm reamer. Any bushes I need to use are easily drilled and reamed to fit my 7mm mandrel. I’m fortunate enough though to have a metal lathe although it could be done on a wood lathe if you have a collet Chuck.