Here is a list of all the postings Dave S has made in our forums. Click on a thread name to jump to the thread.
|Thread: Dressing / Truing a resin diamond wheel|
Im still building my tool grinder, but I have enough bits to do a few trial grinds to make sure that all the various angles and such work ok.
I have an alloy bodied resin diamond wheel that I am using - you can see it in this photo:
I have had it for a while, and it’s been used on the previous iterations of this grinder.
|Thread: Re-making a centre hole in a small crackshaft|
Given the bearing by the crank there is a reference surface there. Either remove the bearing, or use its outer race with some greedy soft jaws such as these:
Now if required can slap on some weld to build up if needed and then machine and remake centre.
|Thread: 2D and 3D Cad Software Recommendations|
I tend to use LibreCAD for 2d for the laser cutter. Mostly like AutoCAD used to be and exports a DXF that the Laser understands - Fusion DXF is to new a version for the laser software.
|Thread: So, you know about clocks!|
You could try Bernard Whitworth near Newark.
|Thread: Locking Bearing preload nut|
Given the nut is pressing against a bearing that will spin freely it will have little tendency to unscrew.
As the bearings are "solid' the preload will not need to be continuously adjusted.
Simple solution, if it was me doing it, light or possibly medium threadlock.
|Thread: Nickel Electroplating|
So if you stop at the right point you’ll end up with a nickel finish?
Might it depend on the voltage?
A different Dave
|Thread: Securing workpiece for parting in lathe or 'left feed'|
I use centre support all the time on the CVA.
This is mystery steel, about 2" diameter:
Just remember to loosen it of as you get towards the actual cut off.
|Thread: Can you recommend a UK supplier for good quality "mill board"?|
So there is an implicit symmetry in the stack up.
Thinking production you presumably will cut the parts from a larger sheet, so an additional op to thin the edges first saves a glue stack up op.
Can you enlighten us about the fundamental changes that having an unbalanced 1+1.5 laminate would cause? In your stack up:
0.15 - Protective film (minimum)
You make no mention of anything “in the middle”, and by your numbers it would add up to 2.9, just inside your sweet spot for thickness.
If you make it to production then presumably you’ll make an order for the right thickness of custom board, so no complexity there.
|Thread: Strange mini "turret" lathe?|
That seems like a bargain.
Wasn't me, currently keeping free machine slot for a rose engine build...
|Thread: Rotary Table Drawbar|
I sometimes stack my RT on a pair of 123 blocks - it only has 2 clamping points when in horizontal mode.
If I had to make that with a vertical only Index I think cuts A and B in the mill, then slot C with a hacksaw as a hand operation.
Edited By Dave S on 30/05/2021 12:46:28
|Thread: How to adjust an EMCO Rotary Table|
It looks like the worm is on an eccentric?
I adjust for smooth travel with a little backlash and then only wind in one direction. That way the backlash doesn’t matter especially.
|Thread: Can one buy pliers with parallel jaws that lock like mol|
I think that your self evident truth is not (true that is).
On the mole grip the adjustment screw is not responsible for all the opening and shutting. The linkage is responsible for the bulk of the opening and shutting. The adjuster sets the end point for the linkage.
If you look closely, you will see that the screw adjust on the mole grips is where a fixed pivot is on the spanner, and the fixed jaw pivot on the mole grips is where the adjuster is on the spanner. The adjustment on the spanner is adequate for the maximum designed opening of the spanners jaws.
I don't know if you have ever taken an adjustable spanner to pieces, but the Jaw has a solid stop on the max opening, and the rack just drops off the end on the close side. This stops the moving jaw falling out when opened, and the massive fixed jaw stops it from falling out on the closed side. If you bend the linkage such that it wont close as far - presumably by being an unsympathetic ape - then the jaw will pass the worm further, until it hits the fixed side. I have mole grip which no longer fully shut - not because of bent linkages, but because the end of the screw has worn and it no longer presses the end point pivot far enough forwards to close the jaws fully. One day Ill fix them with a blob of weld, but the spanner does not suffer from that failure mode (as far as I can determine - i do not own one)
Remember also it is a spanner, not a clamp. Turns out that Makita also make one:model B-65470 Locking Adjustable Wrench.
|Thread: How to mark out features which use the centre as a datum without a DRO?|
Or it could maybe be sleeved to reduce the size.
|Thread: Gage block lapping?|
Im just having a tidy up and checking over my mics and gage blocks. So far the mic measures a selection of the gages correctly, so if they are wrong both of them have the same coincidental errors...
Anyway whilst cleaning and putting the blocks away I wondered how they manage to get such a perfect surface finish at such a (relatively) low cost?
Anyone got good links or info ?
|Thread: Stupid moment|
So I was knocking out a little job for work - needed a HSS cutter thinned from 2.5 to 1.5 mm
No problem, plonk on surface grinder and make sparks.
All good, job done so clean down the chuck and wipe over.
Run knuckle against corner of wheel.
I should point out that the machine was off, and I’d raised the stationary wheel away from the chuck, both vertically and horizontally. But the corner of a 46 grit wheel is just like sandpaper...
As the late JS would say clumsy b@strd.
|Thread: Strange mini "turret" lathe?|
Browsing through ebay, as you do on an evening I came across item 334008021715 - which looks like the offspring of a WW lathe and some sort of screw machine or turret lathe.
Can anyone shed more light on it?
It's clearly solidly built and certainly the tool you need to do whatever job it does.
I have no connection,and SWMBO is quite certain I don't need it...
|Thread: Surface Grinder coolant aim?|
Thanks, I can see me remaking the coolant delivery pipe to be better placed.
I think I have a new set of videos to watch now.
I have a 540 surface grinder, and to help keep the dust down, and give better finish I run a coolant hose on it. I guess it's a flood system, although I have to be careful not to open it fully as it pumps faster than the table drains.... Then it would be a proper flood.
Anyway I currently have the linelok aimed roughly at the grind zone from the back of the wheel - so the coolant is flowing in the same direction as the wheel is running.
This seems to work ok,but i wondered tonight as i was grinding an old crankshaft of i should really aim the coolant against the rotation?
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