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Moved bridge span. The flimsy bits were ripped off and the major part of the load and the vehicle passed under the bridge before stopping.

Martin C

Edited By Martin Connelly on 04/12/2019 13:16:50

Jason, of course 6.33[in H7 & H6?] reamers exist, but the suggestion of a 6.333 will totally confuse the OP.

Tony

@Versaboss

You certainly helped a lot, thank you for that info.

Could you make a suggestion regarding size please so I can make my conversions and order metric reamers.

Say that I have, as I mentioned before, a shaft of 1/4inch +-0.0002" and I want to achieve a tight fit, meaning that I will need for example a set of pliers and some force to remove or a mallet.

Now I can easily find for example H7 reamers who according to standards have a tolerance of +0.00059" in the range of 6mm to 10mm(if I am reading correctly).

In order to achieve such a fit with the above circumstances what should the reamer size be in inch or metric?

P.S. I know I am probably not using the term "tolerance" correctly but you get what I mean.

Regards,

Panos

Thanks for all this input.

No. I have not actually had a cutter 'drawn' on an ER collet either, but aware of the hazard. Understanding that, and looking at my collection of fleabay cutters I wanted to explore what the alternatives are.

Assessing all of this (and another thread or two) I reckon I'll be saving those beer coupons for something else....

Cheers, Colin

.

Yes, Steve : But the Boxford drawing that Pete posted explicitly states 'Plunge Roll'

MichaelG.

.

But why would those experts want to roll an ACME thread-form to Metric dimensions.

True ACME is [to the best of my knowledge] exclusively specified in Imperial units.

... If I am wrong; would someone please tell me

MichaelG.

I guess you'd need to find an ex-employee from the factory for that, or a drawing.

BTW I had an Denford TDS1 and the cross slide thread on that was clearly cut (or at least finished) with a die. The marks where the die stopped were plain to see.

.

Perhaps you could explain then, Steve [please]

Why would anyone choose to specify 16mm x some metric pitch in ACME form rather than Metric Trapezoidal ?

[my brain hurts] ... Is it just to make it difficult for customers to second-source spares ?

MichaelG.

.

Quite so, Dave ... and the Pope is usually a Catholic

I am interested in how and where the Boxford screws were made, because that knowledge might help us understand why they chose to use a 'bastard' thread.

MichaelG.

Right i am slightly confused, do we use a taper drill or not?

Brian

Lots of things have been done by cheapskate methods, including that dam. Long term, they should rebuild it properly from the ground up in massive rocks which cannot be dissolved/washed away like mud.Fill gaps with concrete, job done and 'everlasting.'

I noticed in the Wikipedia entry for the dam that a proportion of the water feeding the dam is diverted into the stream alongside. I assume that steps have been taken to divert all the incoming water into the stream and that it can handle the increase.

These from Hereford and Worcester are 7000 litres / Minute apparently

i.e. 420,000 l/hr and there were at least 23 of them working at one time so about 9.6 million l/hr

Bill

Edited By peak4 on 05/08/2019 19:27:11

Rather than decrying Wikipedia as 'inaccurate why not take a look at some of the plentiful references in the article?

Past research has shown it to be no less accurate than the Encyclopaedia Britannica.

Neil

P.S. Looks to me that the pumps are in the floating yellow bits (sorry Original thought was wrong...)

Edited By Neil Wyatt on 03/08/2019 20:26:32

34046 - Have you checked with Malcolm what excess - if any - he requires to be added to your required dimensions? He's done several laser-cut items from my CAD dwgs and he's queried some of my dimensions thankfully !

The laser-cut edges from the company he used for my items were "rough" and hard. They needed draw filing smooth with a diamond file, I accept that techniques may have moved on in the last couple of years but a small dimensional excess was incorporated to allow for the smoothing-off.

Hi,

I have an 80mm dia. Facing milling cutter with 7 insert locations.

It came to me in a box with a lot of tooling at a local auction a couple of years ago. I have just got to the bottom of the box recently and it was a pleasant surprise as it is in excellent condition, BUT there are no tips to fit it, but the screws are there and don't look as if they have been used!

The only identification is the code A241.80.R.07 The rectangular tips look to be about 12mm x 8mm x 5mm thick with a 3.5mm screw hole. (These sizes are approx)

I have been in contact with several tooling suppliers but as yet none of them can identify what tips I need. I may have to go to a few suppliers and ask to see if I can get something to fit, but perhaps some of the very knowledgeable folks on this forum can identify what I need.