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Member postings for Bob Mc

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

Thread: Hi from Australia, Pick a subject for next post
21/11/2018 13:24:07

Hope this fits in with this thread...

John McNamara says... Greetings from Melbourne OZ

An old mill to a tool grinder. That would be interesting.

I made this tool/cutter grinder using an old flatbed lathe and some other bits I had, the spindle head is from a discarded contact lens making machine and can be moved vertically with the very coarse threaded pillar...similar to the Quorn setup.

The toolpost can be swiveled in x & y axis and rotated about a vertical axis, the whole toolpost assembly is carried on the bed topslide. There is a DTI on the bed to set the amount of grinding so that equal amounts are taken taken off the cutter or drill.

The cutter holder is based on Harold Halls design in his Cutter grinding book and is easily set up for four facet grinding.

Rgds...Bob.

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Thread: What did you do Today 2018
26/10/2018 19:26:08

Been messing about with Mogens Kildes Double diagonal engine...

Have made most of it in perspex as I hope to use it as a template for cutting the steel frames & cylinders, also trying my idea of wedge shaped cross head guides which saves quite an amount of metal and fixing and the cylinders are fed compressed air through the frames instead of external pipes...hopefully.

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18/10/2018 14:34:14

Thanks Neil...

You are making me think now...!

..Bob..

18/10/2018 13:15:45

During a tidy up session I found the jars of brass turnings I had saved over a number of years...and I have quite a lot of brass bits & bobs & offcuts ... was hoping to melt them down and cast something but it seems to me quite a dangerous and involved process... do the scrappers take brass turnings...?

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Thread: MEW 273 Bonus Content
10/10/2018 16:57:31

Thanks Emgee...Thanks Neil..

10/10/2018 10:17:17

How do I get to the 'Introducing the Arduino' article as mentioned in MEW 273 ?

Thanks ...Bob.

Thread: G-gem gib or g-golf -gib?
09/10/2018 09:12:21

When stuffing a chicken...you don't say ' I am pulling me Giblets out ' with a hard G .

Thread: Unusual Oscillating Cylinder Locomotive
30/09/2018 18:28:00

Hi Stew..

yes I saw that at Macc Models...was very tempted, I might be stating the obvious now but have you tried the Stockport Modellers... Dave Wagget email secretary@stockportsme.com

Bob.

Thread: Lathework for Beginners
23/09/2018 11:37:37

Hi Ron, thanks for your message..

I have looked at the suppliers website but they don't actually give any information about the blade or holder other than give its overall dimensions, I suppose I should contact them and ask but I have now made a fitting for my toolpost which puts it in the right orientation and I don't hold much hope out for getting a meaningful response from the supplier as I contacted them previously about another purchase and received an unhelpful reply.

I have to say that with the setup I have now, I am pleased with the way it produces a nice shiny face on both sides of the work rather than the previous flat face setup which produced rough faces and has no chatter with the metal coming off in nice curls...and it just sounds right, and I have ground the blade in the normal way with a flat edge and with the tool fitted to the topslide, no need for rear toolpost or any fancy grinding ....anyway thanks again for your reply to my post.

..Bob..

21/09/2018 21:24:29

Ha...! this is uncanny....!

Re: my post 20.09.2018

in the latest issue (ME 4596) Graham Sadlers article series on "Lathes and more for beginners" actually says that some of the cheaper toolholders do not hold the blade properly giving no clearance either side and are best avoided..

As a famous person once or twice said... "I don't believe it ! " the makers of these bladeholders must surely know that they are making something destined to cause problems...for the sake of setting over the milling machine a degree or two when cutting the blade holder profile... it might work ...but its not right... and I noticed I got a better finish on the sides of the work when the blade was set correctly and is a delight to work with.

Manufacturers in the Eastern countries making many of these tools very rarely puts its name on its products, I may be old fashioned but I do remember reading many years ago not to buy anything where the manufacturer was not confident in putting his name on what he has produced, I am minded to send it back to the supplier.

Bob.

20/09/2018 13:14:40

I'm glad someone mentioned parting problems again, I have had many problems with this myself and although I can part with reasonable results I can't say I have had an easy time, in the end I purchased a new smaller width hss blade with holder from a well known supplier, this is a 1/16 inch blade which I thought would make the cuts easier.

I was disappointed again, the problem in the end is the blade holder supplied,..I looked at the one I had previously as well and I assumed they would both have been made so that fitting it in a normal toolpost set squarely would give the correct clearance angles at the sides of the blade, to my amazement I found that the holders are not made with an angled side face but are just at 90 deg so that there is no clearance at one side of the blade and double the clearance at the other; this causes the tool to move over and dig in to one side.

I made a new toolholder so that there would be clearance either side of the blade...the results were very satisfying.. has anyone come across this before...? or is this obvious to the more experienced.. I am only too willing to learn..

Bob.

Thread: Pillar or radial drill
02/08/2018 22:16:38

I purchased a bench drill from a well known company and was very much disappointed .. the quill had 1/2 inch of play in it and the table could not be locked in position, it moved as you drilled..! I also noticed quite a lot of 'nod' when I trammed the table.

I should have sent it back but would a replacement have similar problems, I decided to make it a project and sort the mess out.

I made an eccentric bearing for the quill and now has no play.

The table did not lock due to the locking nut surface not being parallel with the machined side of the table support arm bearing and consequently there was only one point of contact between nut and surface.

see below..

The support arm.

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The relative angle of the un-machined side.

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The 'nod' was a more difficult situation, so I made a new adjustable 'nod' support arm .. below.

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The table now trams up perfectly...

Moral of the story... should have bought a vintage drill and renovated it..

Thread: Drilling problems & remedies
17/07/2018 11:05:05

Hi All..

I have had this bench drill for a year or so and have had problems with table movement,; if I tried to drill off the exact centre the table would start to tilt in the pressure direction..

Also, when I trammed for the 'nod' ie the tilt in the y axis, it was out by about 1mm over the diameter of the table, and I wondered if this was the reason I couldn't seem to drill a through hole through round stock with any accuracy.

After dismantling the table support arm it was apparent that the table movement problem was caused by the surface that the locking nut had to bear on, it had not been machined from the cast state and was severely angled from horizontal see pic below.

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Below shows how much an angle there is.

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Consequently the locking nut has only a small area of contact with the surface and therefore not much of a hold on the arm.

It can be very disconcerting when drilling a hole to see too late that the table is moving and if you have a similar machine I think it wise to have a look at this part.

I could have machined this surface and left it at that but the 'nod' tilt bothered me as well so I ditched the original support arm and stitched up an adjustable 'not tilt' support arm.

The table can now be adjusted and trammed up nicely referenced to the quill axis,...below..

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...Bob..

Thread: Prototype Mechanical Crab
15/07/2018 17:04:12

Beautiful Steve....!

Its Art...better than any Picasso.

Thread: Age related macular degeneration.
11/07/2018 18:02:27

Hi all again...

Brian Sweeting....I have Wet AMD... this is treatable.. I can vouch for that, I am indebted to Herbert Punter who mentioned Macular Dystrophy and Macushield Gold I have not heard of it as yet and thanks to Ian Skeldon2, I will ask at the opthalmic clinic if I should get some.

I would also again submit my praise for the NHS, the care I have received has been excellent and I was told that the injections/surgery each time cost around £1000, I have had 8 treatments so far!

One thing I would like to find out is how many people per head of the population are affected by this condition? when I go to the clinic there always seems to be a long queue, it must be a very common complaint.

rgds..Bob..

11/07/2018 15:05:35

Thanks Bert and Ady1....

these are the things that people generally don't really want to know about until its too late... better at least to have some knowledge of what can be done to avoid them.

Thanks...rgds...Bob...

11/07/2018 14:57:51

Thanks Michael,

I had not seen that study by nhs.uk/news..... but it seems to confirm my views about taking the supplements.

if I had known about it previous to having this condition I would have gladly taken it and believe me when I say that when you wake up one morning and there are dark patches right in the centre of vision and then find out it can cause something akin to blindness you start to think that your life has virtually finished.

The condition for me has improved due to the fantastic treatment by the NHS opthalmic surgeon and I would not have written this forum post if I had not had the experience of stopping the supplements only to find that the condition worsened, after a week or so of resuming taking the supplements my vision responded quite well again.

The consultant I have for treating the condition was quite adamant that the NHS were totally incorrect is making the statement that the supplements did not make a difference.

....Bob..

11/07/2018 13:10:23

Hi all...

I think that there are many model engineers who are in their more mature years of life and I class myself in this group; I am sure that some of you may have heard of 'aged macular degeneration AMD' which I started to suffer from nearly two years ago.

The condition causes dark areas and distorted vision, just what is NOT required for model engineering, fortunately there is treatment for some types of the condition which includes injections in the eye, and I have had quite a number of these. There are also some medicinal tablets which used to be free for OAP's on prescription, now however the free prescription has been withdrawn and I received a letter from the NHS stating that the tablets are not necessary for people who have a balanced diet.

In my opinion the tablets which can be bought at the pharmacy without prescription DO make a difference and I can't understand why older people are not made aware that they could avoid the condition if the tablets were taken even if your eyesight is good, in my opinion.

I don't want to put anyone off having the treatment there is no pain you don't feel a thing...but the thought was enough to make my hair (whats left of it), stand on end.

I would urge anyone in our age bracket to consider taking the pills which have as a main ingredient 'Lutein' found in Kale I believe.

I must make it plain I am not in any way connected with the medical profession so I can only say seek medical advice if you are considering taking these tablets.

Rgds...Bob...

Thread: What did you do Today 2018
10/07/2018 18:12:01

Had a go at making Will Doggets height gauge using a caliper gauge not required.. see MEW iss 235 p68.

I milled the finger grip flutes with the Dore Westbury set over at an angle as I don't have a round nosed cutter.. below..

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another view..

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The completed article..

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Thread: Workshop in this weather..?
08/07/2018 16:40:44

My air conditioning system...

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