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What did you do Today 2018

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Robin30/09/2018 22:31:26
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294 forum posts
Posted by Neil Wyatt on 30/09/2018 21:54:48:

I guess you know to try meths on the zebra strip?

A zebra strip is layers of metal conductor and rubber insulator. I remember once a factory used a photosensitive resist mask containing sulphur. It took time for the rubber in the zebra strips to vulcanise, expand and break the contact. Plenty of time to test, package and sell the product all over the world smiley

Andrew Johnston01/10/2018 12:16:52
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4155 forum posts
502 photos
Posted by Neil Wyatt on 30/09/2018 21:54:48

I guess you know to try meths on the zebra strip?

Zebra strip? What Zebra strip? The original patent application for elastomeric connectors was in 1974 and I suspect my surface roughness gauge was designed a bit earlier, judging by the internal electronics. The LCD holder is soldered to the PCB, so I can't easily remove it. But it would have been daft to use Zebra strip and run a flexi PCB to the display.

We used Zebra strip in the early 90s on race car electronics and they were a right PITA. If an assembled unit didn't display properly the instructions were to disassemble, reassemble and test again - repeat until the display worked properly. Not my design I hasten to add. smile

Andrew

Nigel (egi)01/10/2018 17:02:53
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15 forum posts
7 photos

I've just finished making a planishing hammer

Mild steel head with case hardened surfaces.

Edited By JasonB on 01/10/2018 17:10:10

Bazyle08/10/2018 22:53:05
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4167 forum posts
171 photos

Gosh, no posts for almost a week.
This ebay ad is interesting for the background. The passing of British manufacturing.

Alan Waddington 208/10/2018 23:49:27
349 forum posts
80 photos
Posted by Bazyle on 08/10/2018 22:53:05:

Gosh, no posts for almost a week.
This ebay ad is interesting for the background. The passing of British manufacturing.

Haha, love the time and effort expended by the seller on the description cheeky.........What a beast, hope someone saves it !

mechman4809/10/2018 19:49:55
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2140 forum posts
352 photos

Did a modification to my Aldi scroll saw; the plastic table insert really is not strong enough to do what it's s'posed to do so set about making an alternative insert... as supplied 'out of the box' …

aldi scroll saw  (12).jpg

Alternative insert...

modified scroll saw table.jpg

Next is to modify the reaction bar / stripper bar, as it is it's only thin MS plate so am looking at making something out of round bar stock.

George.

Sam Longley 109/10/2018 22:22:44
675 forum posts
26 photos

Mechman 48

I followed some plans I found online to make a fretsaw & it is not particularly good. However, I do see ways of improving the design. I intend to have another go just for the hell of it. I did make one years ago that worked very well but I lost it when I moved. Could you tell me please, what you estimate the stroke of the blade on your Aldi saw to be.I think my version has too long a stroke.

I also wonder how many strokes per minute . Although you may find that difficult to estimate.

Any indication would help

Thanks

mechman4810/10/2018 10:28:49
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2140 forum posts
352 photos

Hi Sam

I'm curious too, will get back to you later...

George.

Sam Longley 110/10/2018 11:23:36
675 forum posts
26 photos
Posted by mechman48 on 10/10/2018 10:28:49:

Hi Sam

I'm curious too, will get back to you later...

George.

Thanks

It is just that the existing design has an eccentric driven off a pulley that drives a block up and down 2 posts. I want to drive the eccentric straight off the motor shaft & then have a small shaft running through the block similar to the shaft that drives a steam engine slide valve. Then I will not have the weight of the block etc reciprocating. Hopefully this will reduce vibration. But first i think that the actual stroke can be a lot less than I have, as I only want to cut thin material- up to 3mm. I have a bandsaw for thicker material.

I need to know if the motor is fast enough so that i can eliminate the pulley & belt etc . I can easily slow the motor with a resistor but not speed it up.

It cannot be rocket science & more fun than forking out £ 60-00

 

 

Edited By Sam Longley 1 on 10/10/2018 11:29:18

Martin Kyte10/10/2018 11:37:35
1325 forum posts
9 photos

Couple of comments for using scroll saws for cutting thing like brass clock wheels etc

I would say that the speed needs to be slower rather than faster. Generally the machines are intended to cut wood rather than metal where high cutting speeds produce cleaner cuts. I use piercing saw blades which cut well at 'handraulic' speeds.

A longer stroke is desirable. This uses more of the blade and extends the cutting life.

A blower is a boon to keep the cutting line clear so you can see what you are doing.

I did make something similar to what you describe but driver from the Myford Headstock (Hemmingway kit)

That way you get the speed control and motive power for free.

regards Martin

mechman4810/10/2018 17:42:21
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2140 forum posts
352 photos

Hi Sam
FYI...

aldi scroll saw info.jpg

As for the action...

aldi scroll saw cam (2).jpg

George.

Sam Longley 110/10/2018 19:32:13
675 forum posts
26 photos

Thanks George . That is very helpful. Might even change my plan for the oscillation of the blade.Lot more compact. Have to do some sketches.

bricky10/10/2018 19:32:35
320 forum posts
41 photos

Fitted a base of a cheap drill that was useless as a drill to my floor standing drill column.This to support a car jack as my cross vice is getting heavy to lift.I bored the hole that was there larger to fitt the column,bolted some steel 6"*1/2" *3" to the underside had a 2 3/4" internal diameter tube split to allow two steel pieces drilled 1/2" all welded to the 6"steel a 12mm bolt and the jobs a good one.

Frank

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Chris Gill10/10/2018 21:52:49
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32 forum posts
14 photos

Just to prove nothing goes to waste ...

Here's my rendering of Andy Johnston's headstock handwheel (MEW Autumn special). All materials from stock and the piece of wood was left over from making a new seat for a commode. It could have given someone a nasty surprise if I'd left all that metalwork attached!

2018-10-07 13.51.51.jpg

Mark Rand10/10/2018 22:57:26
581 forum posts

That'll be a pleasure to use when tapping etc. Even safe to leave it attached most of the time!

V8Eng11/10/2018 10:03:30
1178 forum posts
20 photos

I notice that there is a “We buy houses” add in the for sale section today, let’s hope it’s not the start of something.crying

Edited By V8Eng on 11/10/2018 10:05:33

Ian P11/10/2018 10:22:49
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1955 forum posts
83 photos
Posted by V8Eng on 11/10/2018 10:03:30:

I notice that there is a “We buy houses” add in the for sale section today, let’s hope it’s not the start of something.crying

Edited By V8Eng on 11/10/2018 10:05:33

By 'start of something' presumably you mean placing 'Wanted' ads in the For Sale section!

V8Eng11/10/2018 10:39:54
1178 forum posts
20 photos
Posted by Ian P on 11/10/2018 10:22:49:
Posted by V8Eng on 11/10/2018 10:03:30:

By 'start of something' presumably you mean placing 'Wanted' ads in the For Sale section!

I was thinking of what happened on some other Forums which became swamped with unrelated adverts at times!

Mark Rand11/10/2018 13:26:02
581 forum posts

Do they buy workshops as well?

KWIL11/10/2018 16:04:04
3034 forum posts
55 photos
Posted by Alan Waddington 2 on 08/10/2018 23:49:27:
Posted by Bazyle on 08/10/2018 22:53:05:

Gosh, no posts for almost a week.
This ebay ad is interesting for the background. The passing of British manufacturing.

Haha, love the time and effort expended by the seller on the description cheeky.........What a beast, hope someone saves it !

The Willson lathe shown apears to be very similar to 7.5" centre x 5 ft V bed gap precision high speed lathe (477 rpm spindle speed), code word "Newel" selling for £232 in 1942. . Willson Lathes was of course founded in the late 1890s by George Willson, Edwin Barker and Fred Smith In Halifax and was later subsumed into the Elliot machine tools business in the 1960s. George Willson's wife Laura was a leading activist in respect of Women and later was awarded an MBE.

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