Here is a list of all the postings Martin Kyte has made in our forums. Click on a thread name to jump to the thread.
|Thread: Between centres boring bar bit grinding|
Do make a little holder, piece of bar, correct size holein the end and a grubscrew to nip it up. If you use square bar you get constant registration on the grinding rest. Much better than fingers or pliers.
Ignore me if you are already there.
|Thread: English dialect|
Maybe that's because couple means six ?
|Thread: a rat in the house!|
. . . . swallowed the spider to catch the fly . . . . etc .. etc
Get a mongoose.
|Thread: square moulded plastic cutting tool box?|
You need to order a lot of nice , new , expensive tools. Give the tools to your freinds and you get to keep the boxes.
Edited By Martin Kyte on 22/09/2017 15:17:05
|Thread: Omron Yaskawa inverter|
Off the top of my head it should be a linear pot. Inverters usually operate with a 0 to 10V input for the command speed which is generated by OV and 10V from the unit connected to each end of a variable resistor with the wiper wired back to the speed demand input. Check you have a linear pot and that you have the wires to the correct places.
|Thread: Drill flute orientation|
OK, it was just a whimsical question.
Judging by some of the responses some people perhaps didn't quite understand why I asked the question.
It arose because of late I have noticed that I habitually set drills with the flutes vertical and thought "that's strange I wonder if it makes any difference and if it does why".
So I was really talking about lathes that are in good alignment, but recognising that nothing is ever spot on. It could be assumed that horizontal alignment is going to be worse than vertical on amachine with low wear as there has to be some clearence so that the tailstock can slide. Clamping holds it down onto the bed but doesn't really ensure tight alignment horizontally on flat shears. The argumant does not really hold on prismatic beds. Therefor if generally the alignment assumed to be less good horizontally in general and if there is no time cost in orienting a drill one way as opposed to another and there is a preferrential orientation it probably makes sense to do it if you could be bothered.
In reality, I think the practical benifits are almost certainly un-measureable to the precision we are ever going to need which is why it was just a rhetorical question. I just wondered if there were any 'old wives tails' out there.
I'm not worrying at all, as I said I've never noticed any difference, it was purely a whimsical question.
My thinking is that, as speedy says, for normal small errors you cannot practically notice any difference. However my thinking is also that for most reasonable lathes there is always going to be a side to side error rather than a vertical error. For small misallighnment the contact surfaces of the drill are going to be the two linear cutting edges. shaped like a V. If they are vertical and there is a small misalignment horizontally each flank will still touch the centre drilled hole at the same time. If they are horizontal and the tailstock is out in that direction one flank must touch first and be unsupported by the oppsite flank at that instant. So as it's as easy to mount with the flutes vertical as it is horizontal all other things being equal you may get a better start to the hole.
What I really wondered was had anyone ever heard of this being mentioned as good practice before. It may be that it's just a curiosity and of no practical value but I am if anything a curious person.
Edited By Martin Kyte on 19/09/2017 12:35:53
Edited By Martin Kyte on 19/09/2017 12:36:40
As you all like pondering odd subjects how about your thoughts on this one.
When drilling from the tailstock it is clearly posible to orientate the flutes of the drill any way one chooses. The question is 'does it make any difference'. The assumptions are that the drill is in perfect condition but the tailstock is slightly out in the lateral direction but is vertically on axis. The drill is small enough to flex slightly.
When starting the drill in a small centre hole is the the drill more likely to start true if
1 The flutes are horizontal.
2 The flutes are vertical
3 It doesn't make any difference what-so-ever.
PS The question arises because purely out of habit I mount drills with the flutes vertically.
|Thread: A most unusual metal|
I've got a tin can opener !
The other interesting thing about zinc is it screams when you bend it cold.
Have a look at this data sheet
It's plated to look nice and shiny. Zinc is used for sacrificial anodes on canal craft and is similar to aluminium regarding softness, gets quite malleable if heated to 200 deg C and solders easily as you discovered.
"Could I just say it's zinc?".
. . . . . . "No sorry there isn't time"
(on loan from Monty Python)
As I said, Zinc.
Backshells are usually die cast zinc overplated with nickel when they are not metalised plastic. Zinc solders easily.
|Thread: How can I keep a deeply drilled hole straight?|
Or if you have enough space put a bigger hole in the part and sleeve it.
Can't you bore it? Or at least bore as far as you can
|Thread: English dialect|
The inspection department wish to know which species of gnat ?
|Thread: Low profile boring head plans?|
Can you not cut internal dovetails on a horizontal mill with a single angle cutter with the work set over at the dovetail angle? Just asking.
|Thread: All Metals Come From The Death Of Stars|
Why is it simplistic. It just means that the universe is seeded with heavy element by stars which did explode. That would be generally stars in excess of the Chandrasekhar Limit which is about 1.4 solar masses.
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