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Member postings for David Standing 1

Here is a list of all the postings David Standing 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Quick change tool holders
04/01/2017 22:16:36

The following will contain some assumptions - I don't like assumptions, as they can be a fancy word for 'guess', but unless someone comes up with some more definitive data, that's the best we will have to work on.

I am not sure if there is an industry standard for the tool posts and holders, certainly I have never seen a drawing showing the taper dimensions for one, which are one of the critical parts of the setup, and one of the biggest single factors I believe in getting different makes of post and toolholder to mate properly.

So, the first assumption, that Dickson probably set the standard, and if another post or holder is to be compatible, it should be machined to a Dickson dimension. Rotagrip sell genuine Dickson, and also Toolmex/Bison. I have a genuine Dickson toolpost for my S7, and Toolmex/Bison holders, which fit perfectly.

Bison toolholders can be identified by the fact that they normally have (for example, for a Myford standard toolpost, S00/T00 fit) '4494 - 48' etched on the front lower face of the toolholder.

There is a further data sheet on the Rotagrip site, and it lists machines and their correct toolposts:

**LINK**

Firstly, the T and S prefixes to toolposts and toolholders are effectively the same - so, an S00 is the same as T00.

I believe T00 M is Myford fit, and T00 B is Boxford fit.

If you have the correct toolpost, that dictates maximum tool setting height, but the really critical measurement, as pointed out by Peter, is the thickness of the base of the toolholder that the tool sits on, since that dictates getting the tip of the tool low enough to be on centre of the material being turned.

In theory the bottom toolholder thickness will be G minus E in the dimensions on the data sheet. For a S00/T00 this would be 17mm less 10mm tool, so a maximum thickness of the toolholder base of 7mm (.275" ), but I think this is suspect.

In an earlier post Peter you said the minimum base thickness of any of your toolholders was .222. For your info, that is exactly what my Bison 4494 - 48 toolholders measure.

In summary, I know Bison holders fit a genuine Dickson toolpost perfectly, because that is what I use.

Lyman seem to be well recommended (noting Robbo's caveats above), but personally apart from those I would only trust Bison to accurately fit a genuine Dickson toolpost, and to be accurately machined.

Or, to put it another way, if you are trying to mate RDG or Chronos or whatever posts to holders you are probably perfectly ok to mate same supplier to same supplier posts and holders, but if you are trying to mate Chinese or Indian toolposts to anything, or Dickson/Lyman/Bison to Chinese/Indian etc, expect potential problems.

I would also say that I mention Dickson and Bison not as a plug for either, only because I know they are cross compatible; and only mention Rotagrip as supplier of both, and the source of the datasheets.

 

Edited By David Standing 1 on 04/01/2017 22:38:16

Edited By David Standing 1 on 04/01/2017 22:38:44

Edited By David Standing 1 on 04/01/2017 22:45:28

04/01/2017 09:46:11

Nitai and Peter Spink:

All the toolpost and holder dimensions are in the Rotagrip link I posted two days ago, further up this thread smiley.

Thread: Motorcycle General Discussion
03/01/2017 17:14:42

I wonder which nail in the British motorcycle coffin that was! wink 2.

Thread: The Beauty of Tools
03/01/2017 08:05:08

Shouldn't those all be neatly lined up in size order? surprise.

See what you started now! wink 2.

Thread: Anyone recognise this logo from a four jaw chuck?
03/01/2017 07:59:57

Your memory serves you well:

http://www.lathes.co.uk/victoria/

Thread: The Beauty of Tools
02/01/2017 16:44:10

Quiet day? wink 2 laugh.

Thread: Quick change tool holders
02/01/2017 12:09:46

And this link will give you the dimensions of both toolposts and holders.

http://www.rotagriponline.com/datasheets/toolposts.pdf

Thread: Original Myford raiser block queries
01/01/2017 21:43:10
Posted by KWIL on 01/01/2017 19:06:02:

It does not have to for you, the OP has said he has got the hang of it and is going to have a go. fist

Well, Happy New Year to you too surprise.

Have i done something I am unaware of to upset you? sad.

Thread: Has anyone got any experience of Warco GH1236 lathe
01/01/2017 17:59:26
Posted by Alex Bellringer on 31/12/2016 14:50:01:

i don't retire for 44 years and 10 months though maybe a bit of a time to wait

Holy shit, I hope Baz hasn't depressed you too much! surprise.

Thread: Original Myford raiser block queries
01/01/2017 17:42:42
Posted by KWIL on 01/01/2017 17:30:39:

As I said two differing lengths of 5/15" BSF were available from Myford. You can take your choice how you interpret their use.

Well, unfortunately that doesn't clarify the situation sad.

29/12/2016 23:03:51
Posted by KWIL on 29/12/2016 22:52:57:

David,

Robbo is quite correct, the original bolts were or should be part screwed to the block so that you can bolt down the raising block independently of what ever is sitting on the raising blocks. At least the ones I have on an ML7 and Super 7 are. Originally two differing lengths of 5/16" BSF studs were available from (old) Myford.

I have made other raising blocks by preparing round bar to appropriate dimensions, fitting O rings and fitting levelling screws as normal.

KWIL

Not trying to be pedantic, but the OP is already confused, and a reference to 'bolts' is likely to cause even more confusion. It has confused me.....

Are you really saying that 'bolts' (as we understand them) were used in conjunction with the raiser blocks in some cases? How would that work then?

Or are you saying studding (threaded end to end, not at each end like most of the raiser block studs you see) was used, and the raiser blocks were threaded internally?

Thanks

Thread: Take a look?
29/12/2016 22:25:00
Posted by richardandtracy on 29/12/2016 22:21:04:

With the thing worth £50 million+, not really.

Regards

Richard

It was a spacecraft. Couldn't you have just fired it to its destination - into a low earth orbit, then drop it out of orbit on to where it needed to be? smile.

(Apologies Richard, I sense a competition starting here......smile p).

Thread: Broken ML7 tailstock handwheel! Help!
29/12/2016 21:45:15
Posted by Andrew Tinsley on 29/12/2016 20:12:00:

I have always thought that cast iron was virtually unweldable by any method

I have seen references to mig welding of cast iron which had a lot of caveats, which I take to be an unreliable method.

Andrew.

 

Andrew

I did, many years ago, successfully stick arc weld (cold!) a cracked cast iron car exhaust manifold, but I wouldn't recommend it wink 2.

Edited By David Standing 1 on 29/12/2016 21:45:48

Thread: Take a look?
29/12/2016 21:30:55
Posted by Neil Wyatt on 29/12/2016 21:29:17:

Observation on CE marks.

How can you 'attach the mark to it anyway to show it complies with the standard' if there is no standard (e.g. small boilers)?

Neil

Neil

Perhaps what it needs is a 'CE exempt' sticker devil.

Thread: Locomotive Modelling in Ireland
29/12/2016 21:23:13
Posted by Ady1 on 29/12/2016 21:09:28:

There's quite a few articles on working stainless in here

But I don't think it answers the OP's question? blush.

29/12/2016 21:22:20

Welcome to the forum smiley.

And, may I point out on a point of etiquette, copying and pasting my tool cutter grinder wanted ad into yours is on the threshold somewhere between lazy and plagiarism wink 2.

Thread: Original Myford raiser block queries
29/12/2016 20:19:27
Posted by choochoo_baloo on 29/12/2016 19:07:28:

Does anyone know how the studs are held in the blocks? Also are the O rings just a push fit in the recesses?

Ideally want to remove the former, and definitely remove the latter, for stripping and re-painting the blocks.

Wasn't my post of 19:08 yesterday clear? sad.

When I said the studs are a loose sliding fit in the jackscrews/raiser blocks, I meant nothing holds them in, apart from the nuts above them stopping them dropping through. If yours are stuck, it is because paint/crud is stopping them from sliding through by gravity.

And yes, the o rings are just a push fit in the raiser blocks. New ones would also be an interference fit on the studs too.

Thread: Rishton ID and Myford curiosity.
29/12/2016 16:21:56

Re the Rishton, have you contacted WEC, their current parent?

http://www.wec-machining.com/about.html

Thread: Take a look?
29/12/2016 13:52:32
Posted by Ajohnw on 29/12/2016 13:13:49:

I'd like to see some proof that things that don't need to have a ce mark shouldn't have one.

What I suspect is needed is a book called something like " A Guide To Steam Boiler Regulations for Model Engineers ". It seems it should also contain some design aspects as certain things seem to be verbotem.

I suspect it would have to be written by some august body not directly related to model engineering in order to ensure that it's ok.

John

-

That's a brilliant idea, I'm surprised nobody has thought of it already!

I might write it myself, but if I do, I think I might call it 'The Examination & Testing of Miniature Steam Boilers' smiley.

Thread: metric or imperial lead screw
28/12/2016 20:38:28
Posted by sean logie on 28/12/2016 19:50:28:

Found some photos hope they help put some light on the situation .

Sean

It puts no light on why you have a sweetcorn cob holder in the picture surprise.

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