Member postings for John C

OK, Clive, I'll give that a try. Thanks again!

John

Thanks again Clive. Having reassembled the thing, it now reads almost spot on at the thimble but 0.5mm high on the rod! The thread is 0.5mm pitch which may have a bearing on this, but I have yet to see how, apart from a huge coincidence.

More thinking required.......

Hmmmmm, curiouser and curiouser......

The thread inside the graduated thimble engages with the thread in the body with the fixed anvil. So their relationship is fixed. There appears no way to turn the lubber line relative to the thread in the body. The rod that moves within the body is driven by the shoulder against the inside of the graduated thimble - again this relationship is fixed. The hole at the end of the thimble is a sliding fit on the narrow portion of the graduated rod. The threaded washer and dome nut merely adjust the backlash. So unless I am missing the blindingly obvious, I can see no way of setting the mic except altering the position of the moving anvil on the rod - which seems a bit crude!

Any further suggestions gratefully received.

John

It's a fixed thimble, Clive. I shall have a go at removing the screw. Many thanks for your input,

John

I have acquired a Brown and Sharpe 252 internal micrometer. This is a very nice item, very smooth and in good condition. However, I can see no way of adjusting or calibrating the device. There is no hole for a c spanner to rotate the lubber line, as on similar micrometers. There is what appears to be a stamped figure Z or 2 adjacent to the fixed anvil, and a screw with collar on the end of the barrel. The moving anvil is a good fit on its shaft, secured with a grub screw, but with no obvious sensitive adjustment.

Does anyone have experience of this model that can point me in the right direction to correctly zero the reading?

Many thanks,

John

Edited By John C on 10/10/2017 10:06:05

The wheels are on an arbour which is secured by a nut with a LEFT hand thread - a C spanner will undo the holding nut. I don't have arbours for each wheel, so I have to dress the wheel after each change. I have found that there are two hole diameters for wheels: 1 1/4 or 32 mm......different enough to make a difference. My arbour is 1 1/4.

John

Edited By John C on 18/09/2017 20:29:50

Did you check it though, Vic - with a steel rule AND a magnifying glass........

Blimey Rod, that was quick!! I shall go and try to find it.

Thanks again,

John

Edited to add - found, I doubt if I would have stumbled across it with random searches.

Many thanks Rod,

John

Edited By John C on 31/08/2017 18:55:34

I am certain that I have seen, in one of the many M.E. books, plans for a device to hold thin stock very similar to the one shown in the photos. However, a search of my bookshelves has proved fruitless. Does anyone remember where such a device was described?

Many thanks,

John

Hi Alfie,

I have sent you a PM. Check the envelope icon 'INBOX' on the very top line of the page.

Rgds,

John

A 'Senior Moment'......?

I'll get me coat.

Edited By John C on 16/07/2017 10:19:46

Andy,

Check your message box - envelope icon and 'INBOX' on the very top line of the page.

Rgds,

John

I'm with Hopper - check the spindle thread and register for burrs or dings.

I too use Bondlock, with no complaints so far. It used to be available from Toolstation but not any more. I found it considerably cheaper than Loctite.

John

Brian Caddy of Slideway Services did my Super 7 bed and saddle. Excellent job.

John

Hi Mike,

I have had very good results from the grinder, and it was definitely a worthwhile investment. One thing I have learned is that it is essential to dress the wheel regularly - I now do this before every use. Failure to do this leads to a clogged wheel and poor finish.

The grinder is fitted with a Brammer type belt and in cold weather the motor struggles to get up to speed.

I haven't stripped the machine down, although I suspect there will be some wear in the slides.

Looking at your photos your machine seems newer than mine, with the calibrated 'cross slide' hand wheel.

Mark - I wouldn't mind checking my ways if that would be possible - I am just north of York.

Best regards,

John

Edited By John C on 04/05/2017 08:26:12

Bucking the trend here, but... I have a set of spiral taps bought from Cromwell on special offer. Still not cheap though, but very good value for money and work very well indeed especially in blind holes.

John

Hi Harry,

Whereabouts are you in the country? Depending on what the front to back limitation is, I may have just what you need! I am north of York.

I will send you a message with pictures.

Regards,

John

Hi Matt, private message sent,

John

Another 'excellent service' award - Steve Cox of Landylift for the efficient moving of two large machines. No connection other than a satisfied customer.