Hi oil magnet.

You can still use it although I would send it back for a replacement including cost of postage.

Draw four lines at 90 degrees.

The centre is in the small square in the middle.

regards david

Are you sure that it is the straight parts of the square are contacting the bar annd not just the tips. Looking at the picture the bar looks to be on the limit of the capacity of this square. If the square is the fault it is a very large error in manufacturing. I was looking at some 90 Deg. squares on a stand at Harrogate and they were well off square. I finished up buying a Soba one which I could not check at the time as it was in a sealed box. It did turn out to be OK.

Les.

Hi

Just out of interest I transferred your picture of said centre finder into my drawing package and measured the included angle between the blade and the exposed leg. This turned out to be within 0.5 degrees of 45 degrees. While not a particularly accurate way to check things it does indicate that the error you are getting is greater than any apparent error of the finder. I support the comments by Les that the bar looks to large for the finder. Prior to sending it back I would try it out on a smaller diameter rod and see if the same error exists there.

Cheers

Martin

Superimposed the bar/rod onto the finder and it should fit between the legs albeit a bit close but should be OK . A quick measurement fom the photo on the drawing package supports this with the legs measuring, from photo, 50mm and the radius of the bar/rod 38mm. Not true world but gives a relative measurement that confirms clearance

Edited By Martin W on 18/05/2012 11:05:02

Edited By Martin W on 18/05/2012 11:09:44

Hi Norm

Yeah I know but in this world everything is relative so  I measured relative to what I had got , namely the picture. Anyhow what does the 40mm refer to? Is it the length of the blade, the guides or the maximum diameter that can be accomodated? I don't know so left it how it turned out so 'Bob's me uncle' and that's relative as well.

Cheers and take care.

Martin

Edited By Martin W on 18/05/2012 13:08:18

Oil Magnet if I may suggest go to your local trading standards officer (if they are not in conference (aka down the pub). This is totally contrary to the Sale of Good Act as it is “NOT of merchantable quality and fit for the purposes for which it was intended” i.e. to mark the centre of a round item.

Mind you if they were anything like the lot where I used to live you could NEVER contact them!

rdgs

Dick

Hi Hansrudolf, take another look at OM's close up photo of the square, it clearly shows that the marking off blade is over the centre point of the vee, hence the need to cut some off.

Regards Nick.

I agree…

To my excuse: not knowing this instrument, I thought the shiny surface was from the part which has to be marked.

Ashamedly hiding in a corner,

Hansrudolf

Send the heap of scrap back! Our manufacturers were screwed by cheap Eastern goods, now they are gone the suppliers left will have to come up with the necessary quality, don't accept rubbish!

Tony