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Member postings for Robin

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

Thread: Painted granite surface plate
18/10/2021 22:08:07

That's a relief, I shall do the sides next.

Methylated spirit seems to dissolve the green colour of my Scotch-Brite so I will switch to Regina Blitz.

18/10/2021 18:21:50

I just bought my first surface plate in black granite.

At least I thought it was black until I looked at the bottom which appears speckled grey bordering on white.

Knowing the Chinese proclivity for making something nice then destroying it at the last moment, I cleaned off a layer of paint using acetone, methylated spirit and Scotch-Brite.

It is still dark grey but a lot smoother. My height gauge slides around like Torville and Deane after a few bevvies.

Have I destroyed it? smiley

Thread: Parting off - front or rear
16/10/2021 09:50:35

I thought this was a wrinkle for spindles running in bronze bushings.

Normal wear on the bushing is at the top.

By putting the parting off tool at the back upside down you could use the unworn bottom of the bushing.

If you have tapered roller bearings then it is for fun only.

I like fun.

I could be completely wrong about this, but not about the fun part smiley

Thread: What Did You Do Today 2021
13/10/2021 10:41:25

For the first part of this millenium I was haemorrhaging tap wrenches. I like the Eclipse ones but they are usually a bit pricey.

Suddenly the price on Amazon has collapsed. I popped a 240, a 241 and a 242 in my basket then had to add another 241 to push it over £20 and qualify for free shipping.

They are now arriving and look like the real McCoy.

I expect everyone else gets them free with cornflakes, I am usually the last to know, but thought I should mention it just in case smiley

Thread: Mill power feed using stepper motor
07/10/2021 19:52:16

I think mine is much prettier but it's running off a Z80 so no points for processing power.

I have one suggestion: Put a pulley on the handle and hang weights off it until you know how much torque you need to break it free.

It is very hard to guess and you don't have to.

Thread: Small Hydraulic Press Tools
04/10/2021 00:49:45

Me too smiley I discovered that I could buy the standard car engine hoist ram for not a lot.

It has a 19.5" stroke for broaches and supposedly delivers 8 tons.

Take that with a pinch of salt, but as my personal taste in broaches are all rated <2 tons it matters not.

I very nearly finished it but then I blew my CNC software and everything stopped sad

Thread: Saving the Planet or is it ?
27/09/2021 22:55:02

Can they switch Drax back to coal or is it stuck burning wood? I hear that Chris Huhne, liberal energy loon in the Cameron Clegg partnership, has made a fortune converting American forest into wood pellets.

Thread: Not enoughh CO2 ?
27/09/2021 21:43:36

Pre-1880 pre-dates Phileas Fogg so the error bars widen wink

27/09/2021 11:47:02

I don't quite understand how CO2 can affect the climate without warming it???

"Overall the globe has cooled substantially since the last El Nino ended in 2016, and it now appears the cooling trend will persist another year as the CFSv2 is forecasting a La Niña to continue into spring 2022".

A bit of a cheat there because there was a spike in the 2016 temperature, but with the global warming freaks getting the screaming ab dabs about anywhere on the globe having warm weather, you can't really blame them.

The extra CO2 continues to have a dramatic effect on my garden where the plants are on a binge and are growing quite out of control. My lawn has tussocks.

Thread: Back to Imperial
23/09/2021 20:31:40
Posted by SillyOldDuffer on 23/09/2021 11:12:12:
Posted by Robin on 23/09/2021 09:56:43:
Posted by Jon Lawes on 23/09/2021 05:29:42:
Posted by Peter Greene on 23/09/2021 01:49:34:
Posted by Robin on 21/09/2021 10:14:21:

...

...

...

I feel your pain. Unlike Gerber, AutoCAD defines an arc by angles rather than by end points, Stray from the cardinals and nothing quite fits sad

Is that true? In my youth I failed to get on with AutoCAD because it had so many features that I didn't have time to explore, but many people rated AutoCAD highly. I found it difficult to navigate. Now I happily use QCAD for all 2D plans. Although simpler than AutoCAD, QCAD has ten different ways of drawing arcs only two of which require angles. I'm surprised AutoCAD doesn't do much the same: possibly other arc options are hidden behind a sub-menu?

I remember reading an article about AutoCAD in MEW or ME where the author reported lines not joining. I wondered if he was driving AutoCAD wrong, either by not selecting the right tool, or not setting the appropriate snaps. The latter are important and not always obvious.

Dave

Lots of ways to draw an arc, the problem comes when you want to extract that arc in to your CNC to cut it.

AutoCAD gives you a dxf or drawing exchange file from which you can extract the drawing entities.

Lines have start and end co-ordinates.

Arcs have a centre coordinate, a radius, a start angle and an end angle.

I actually use the more affordabe ProgeCAD but sadly they rather lost the plot drawing tangential lines and arc with version 2019 sad

23/09/2021 09:56:43
Posted by Jon Lawes on 23/09/2021 05:29:42:
Posted by Peter Greene on 23/09/2021 01:49:34:
Posted by Robin on 21/09/2021 10:14:21:

The problem with metric is that third digit on the DRO or digi-caliper.

+1

You think that's bad; whenever I try to work out anything using Pi I have to give up after just a few hundred decimal places.

I feel your pain. Unlike Gerber, AutoCAD defines an arc by angles rather than by end points, Stray from the cardinals and nothing quite fits sad

21/09/2021 10:14:21

The problem with metric is that third digit on the DRO or digi-caliper.

The hours I spend setting it to perfection on the cross slide only to see it blasted out of existence the moment tool tip meets steel.

Come back thou, all is forgiven surprise

Thread: What Did You Do Today 2021
13/09/2021 10:26:15

Yesterday I turned off everything in the workshop, shut down my computers and went with my son and my granddaughter, aged 6, to Chessington World of Adventures where I spent lots of money. Best day ever smiley

Thread: How to post lithium batteries?
10/09/2021 15:26:00

You can send new lithium batteries fitted in new Chinese goodies. However sending them back would be a different kettle of fish. Do I want my new Chinese goodies in the same van/lorry/aeroplane as your duff Chinese goodies that may have failed because they were so cheap they had to skimp on the battery protection circuit? smiley

Thread: Milling machine coolant system
31/08/2021 17:24:00

I use a 1/4 hp suds pump and flow rate is not a problem.

I return the suds to the tank via a filter bag designed for straining carp pooh out of a koi pond.

That keeps the flow restriction tap clear.

Thread: Design Award
18/08/2021 09:14:31

Second place went to the chocolate teapot wink

Thread: surface grinder
10/08/2021 18:34:24

Also sold motorised as the Tormach PSG-612. Loved the video so I bought the cheap one smiley

I replaced the "hawser", connecting the grinder to its counterbalance weight, with a 6mm chain.

I removed the strangely imprecise, right angle Z handle and fitted a 6mm ball screw where it used to be.

I love the idea that after diamond dressing the wheel you know its exact height above the table.

I want to motorise Z, as well as X and Y, but it is proving tricky.

Thread: Yet another scam
01/08/2021 13:23:54

Royal Mail logo and ZIP file link at the top they want me to click thinking

Hi Customer,

Your parcel from Online Seller - is over due to be delivered:

Monday 26rd July 2021*

Between

07:54am and -1:54pm*

Note:THIS MESSAGE WAS SENT TO YOU AT THE REQUEST TO NOTIFY YOU THAT THE SHIPPING ADDRESS PROVIDED AT OUR FACILITY IS NOT CORRECT AND THE PHYSICAL PACKAGE MAY NOT BE DELIVERED UNTIL THE ACTUAL SHIPPING ADDRESS IS VERIFIED. SEE ATTACHMENT FOR MORE INFORMATION TO BE VERIFIED WITHIN 48HRS.

We won't need a signature.

*Please be aware this is not a guarantee.

Thread: Paypal payment delay
01/08/2021 13:12:07

It used to be easy to refund on PayPal because they refunded their fee and I refunded the rest.

Then they changed the rules and stopped refunding their bit. Didn't stop the seller from wanting 100% and not one penny piece less though.

Either this seller is being generous or he has a much better deal from PayPal than I do.

Probably the latter, I am fairly convinced my purpose in life is to fund other folks dodgy get rich quick schemes dont know

Thread: Leveling machines
27/07/2021 11:39:24

I bought a cheap Chinese Engineer's level. Luckily it was very easy to fix when I discovered that the rubber bungs at either end were removable.

The pivot hole drilled through one end of the bubble assembly was hopelessly cock-eyed and it was instead supported by a bent wedge-thing crudely formed from a strip of Chinesium.

I removed the wedge-thing, drilled a new pivot hole through the other end and turned the assembly around.

I then had a quality tool at a bargain basement price, assuming you don't look at the non-adjustable crosswise bubble that is thinking

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