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Member postings for Gary Wooding

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

Thread: diameter calculation
16/10/2019 12:18:37
Posted by duncan webster on 13/10/2019 23:55:52:
........... but just to be pedantic, don't you need to use the cosine rule to find angle C to start the whole thing off rather than sin rule

Yes, you're right.

Thread: Lidl grinder/belt sander 29.99
15/10/2019 16:31:54

I guess the tool bit wasn't long enough.

Thread: Built-up edge
13/10/2019 22:04:51

I sometimes get the same problem even when using WD40. The weldup is sometimes quite difficult to remove even with a screwdriver bit, but it eventually does come off with no detriment to the cutting tip.

Thread: An interesting repair to an Hour Wheel
13/10/2019 13:38:04

I think its ingenious. Not pretty, but effective.

Thread: diameter calculation
13/10/2019 10:38:21

Just to dot all the 'I's, here is my 'proof' of Nick's solution.

It depends on two properties of chords in circles, and the Sine rule of trigonometry.

1. All angles subtended on one side by a chord to any point on the circumference are equal, so in the diagram, angle C equals angle D.

2. If the chord is a diameter, the angle is 90°, and conversely, if the angle subtended by a chord is 90° then the chord is a diameter.

3. The Sine rule states that, for any triangle, Sin A/a = Sin B/b = Sin C/c

In the diagram, A, B, and C, are the three random points, and the circle is their PCD. You want to calculate the length of its diameter.

Choose any side of the triangle ABC (side AB in the diagram) and draw a perpendicular line from one end to to meet the circle. This is the dashed line BD.

Because they both come from chord AB, angles C and D are equal, so SinC = SinD.

But SinD = c/h, so h = c/SinD = c/SinC

But angle ABD is a right angle, so h = the diameter of the circle.

chords in a circle.jpg

Thread: Metal expansion
04/10/2019 17:25:21
Posted by Nicholas Farr on 04/10/2019 14:42:36:

As for water does it really expand when it freezes? water becomes ice when it freezes, so maybe it can be considered no longer water. Ice of course is less dense because it expands and is lighter than water for the same volume, hence it floats on water.devil Change of state and all that.

Regards Nick.

Just because it has different names doesn't mean its different substances. Ice, water, and steam are all names for the substance also known as H²O. Water starts to expand when it gets below 3.98°C and reaches its minimum density at 0°C.

04/10/2019 14:00:05
Posted by SillyOldDuffer on 04/10/2019 13:49:45:

Quoting the handbook I see I've been careless again: the metals expand on solidification, which isn't necessarily the same as expanding on cooling.

blush

Dave

Same as water, which expands when it freezes. In its solid or liquid state it expands on heating, it's just the transition that is odd. Lucky though, otherwise ponds etc would freeze from the bottom up - but unlucky too 'cos Titanic hit a floating iceberg.

04/10/2019 12:46:34

Imagine a block with a hole drilled through. Now image a plug of the same material that exactly fills the hole. Ignoring friction etc, the plug can obviously be removed and inserted at will. Now, with the plug in position, heat the block and plug up together. Clearly the plug still fits the hole, so the hole expands the same as the plug.

Thread: 3 Phase
30/09/2019 07:13:01
Posted by Andrew Johnston on 29/09/2019 10:59:58:
Posted by Gary Wooding on 29/09/2019 10:26:44:

Hence no loss of power.

Pay attention there at the back. smile

Andrew

Whoops! Sorry sir. embarrassed

29/09/2019 10:26:44
Posted by Andrew Johnston on 29/09/2019 09:32:04:

Incidentally a star connected motor will run just fine off an inverter producing 3-phase at 230V phase to phase. The issue is that the phase currents, and hence torque and power, will be down by a factor of 1.732, aka the square root of three.

Andrew

In a star connected motor running with 440v 3-ph, each winding "sees" 220v, which is exactly the same as they see when running with 220v in delta layout. Hence no loss of power.

Thread: Any idea where to buy a square file 1/4" x 1/4"??
29/08/2019 12:25:14

+1 for a 3-square file - it makes sharper corners.

Thread: Tyres for bandsaw
29/08/2019 07:31:52

I purchased a roll of the self-amalgamating tape but since it was 20mm wide and the tyres are only 12mm I put it to one side while I figured a way to accurately trim the width.

I then saw Alastair's and Mark's posts about neoprene and bought a roll of 12x1.5mm, cut lengths equivalent to 75% of the circumference and superglued the ends together. When stretched over the wheels the tension is so great that I didn't bother with glueing them on. They worked perfectly. We'll see how long the superglue holds.

Good result, the saw is back in service. Thanks everyone.

Thread: ACME thread identification question.
25/08/2019 17:22:19

Here's how I insert a link into a posting.

Copy the URL of the link you want, either by writing it down or using the Windows COPY facility (ctl+C).

Then click the LINK icon above to bring up link window and enter the information required. When you click OK the link data is saved t the cursor position.

**AnyThing***

add a link1.jpg

add a link2.jpg

add a link3.jpg

Thread: Bandsaw blades
25/08/2019 14:22:37

I have the Axminster 4.5" - it's about 25 years old. Neither wheel has a tyre. Here's a couple of photos of the drive wheel - one with the vertical table in place and one with it folded away for horizontal sawing.

bandsaw1.jpg

bandsaw2.jpg

23/08/2019 10:52:35

I wrote ***THIS*** article for MEW about soldering bandsaw blades a few years ago.

22/08/2019 07:43:19
Posted by Cornish Jack on 21/08/2019 17:18:01:

Just broken the blade on my Naerok bandsaw - bought secondhand 40 years ago, so possibly a bit overdue!

It's a 70" length ??tpi and has been used on wood, ali and plastic. The only specified length replacement I can find is a 6 tpi wood use only. As a confirmed 'tool magpie', I have two stick welders and a recent Lidl purchase - Mig welder??? I have never welded anything, ever!, so I suspect that any attempt is doomed to failure BUT, is it worth trying? , and with which one? Also, can anyone suggest a UK source for Naerok compatible replacements

TIA

rgds

Bill

Hi Bill,

I also have a very old Naerok bandsaw, which I appears to be identical to **THIS* Clarke cbs355 bandsaw.

Thread: Digital inclinometers
18/08/2019 08:15:53

Definitely +1 for a Wixey.

But it really loves batteries - I always remove the battery when it's not being used.

Edited By Gary Wooding on 18/08/2019 08:17:32

Thread: Borrowing
17/08/2019 21:54:28

It rains upon the Just and on the Unjust, both together

But it rains more upon the Just

Because the Unjust has the Just's umbrella.

Thread: Centec 2A riser block
15/08/2019 07:26:29

NDIY:

I made several batches of RBs. The 1st batch had the Centec logo machined into the side and hi-lighted with black paint, as shown in the first 3 photos. The subsequent batches had the brass labels shown in the last photo, but I fitted them only on the 1st of them. For the remainder, I supplied the badge and hammer-nails with instructions on how to fit them, but left the actual fitting to the buyer. You possibly have one of those. I fitted stainless dome nuts and thick machined washers to all my blocks, so if yours has them then it could be one of mine.

The 457mm length was as I ordered, but I had to clean them up and possibly lost a mm.

14/08/2019 22:01:53

I got the alloy bar from Richard Austin Alloys in Coventry.

No problems have been reported about the VH's weight on the raising bar when slid in the forward position.

I don't think it matters at all if the female dovetail was a little on the large side. There has to be clearance otherwise you can't slide. The fingers push the male dovetail sideways so there will be a gap on the finger side, but none on the other.

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