Losmandy bar

[simon84]

Evening,

I'm going to be making my own Losmandy style dovetail bar so that I can fully customise it for my own attatchments.

Would someone be so kind, if they have a los bar handy, to just double check the 74mm dim and the 65 degree angles for fitting in the puck.

I've taken a rough measurement with an old helix angle measurer I found in my sons pencil case but I've nothing more precise to hand at the moment.

The 100mm measurement is an approximate and will be controlled by the angled cut and the 3/4" ali bar I intend to use.

Cheers in advance.

[simon84]

Sorry forgot to add the drawing.

[davew]

The top part of the plate ( 9mm underside bit ) is not angled. I too have a Helix set !

Dave

[simon84]

Hi Dave,

I thought that but I only have access to square cutters so to get the 65 degrees I have to have the underside angled at 90 degrees.

It wont be a problem as I only have an 80mm refractor or my camera being mounted on it.

I take it the other dims checked out ok i.e. 65 degrees and the 74mm?

Cheers,

Simon.

[Merlin66]

Simon,

I've just measured my Losmandy plate:

Total thickness: 12.7mm

Thickness of top section: 6.65mm

Width of "wedge" section at base: 74.7mm

Width of "wedge" section at narrowest: 70.0mm

so each angle would be 2.35mm/ 6mm..... if that makes sense.

Ken

[davew]

Hi Simon,

Now I understand your thinking. As for the measurements, sorry, I'm not within reach of my mount to check. I'll look later unless some kind soul comes along with better info.

Dave.

[davew]

There you go, as I typed.

[simon84]

Thanks for the data Ken.

All drawn up now ready for machining.

As soon as my WO rings turn up I can get the slots put in it and hey presto......

Well fingers crossed anyways.

Cheers for the help.

[simon84]

One more dim if you can Ken, whats the overall width of your top section?

Cheers,

Simon.