What Did You Do Today 2019

Made a couple more angle plates today, a 30*- 60* & a 70* - 20*…



George.

Great stuff, George

MichaelG.

The GemRed web site for digital angle gauges specifies a resolution of 0.1° and a repeatability of ±0.1°. You would need a sine gauge for anything more accurate.

Edited By Paul Lousick on 05/01/2019 00:40:31

.

So presumably George is actually displaying 45.1 degrees, and 45.0 degrees

MichaelG.

Edited By Michael Gilligan on 05/01/2019 00:49:01

Broke a 10BA tap today, that the third tap I,ve broken in 60 years! The last one was also 10BA and the first one was 1/4" Whit on the end of a 4ft long tap wrench in the crown of a 12" piston.

Brian

Brian H

Clumsy

Digi readings as displayed for the later two angle plates …

60* side...


30* side …


so; 59.9* + 30.1* = 90 *

20* side...



70* side …



so 70* + 20.1 = 90.1* I'm contributing the 0.1' discrepancy in all down to the digi gauge +/- 0.1* as mentioned by
Paul Lousic's post …

''The GemRed web site for digital angle gauges specifies a resolution of 0.1° and a repeatability of ±0.1°. You would need a sine gauge for anything more accurate''.


Just in case the question is asked I zero the digi gauge before readings on ea. side...



So now that I've refreshed my old grey matter with trigonometry workings I'm a happy bunny... now on to a couple more - 5*-10*-15*- 25* using the same methodology... … don't think I need to post on the rest.

George.

Reading Mr Cutwel’s latest caralogue that arrived recently, I noticed that one of their indexable face mills is advertised as having “hugh feed rates”. This means a feed of 1.0 to 1.5 mm per tooth in carbon & alloy steels. I suspect that my little Sieg mill might not be up to that!

Finished off the set of angle plates; all within 0.1* according to my digi gauge...just need a bit more polish up...



George.

Completed my Drill Alignment microscope jig to align drills in my 4 facet grinding jig ( previously posted on).

The optical head is a Bausch and Lomb Zoom microscope, and I fitted a horizontal reticule in the right eyepiece after some advise and guidance from Robert Atkinson - Thanks Robert!

The 5C collet in a square block holder sits on a focusing stage as seen.

The focusing stage - drill end view

Focusing stage - side view

Th reticule is a plastic ring sized to fit inside a threaded reticule holder that screws into the underside of the eye piece. A single fibre of fibreglass was teased from some weave, and superglued to the 180deg apart slots made in the sides of the plastic ring. The ring then inserted in the holder and screwed into the eye piece until focused.

View ( focus was difficult..) of the fibre reticule in place, from the bottom of the eye piece.

View through the microscope, focused on a 3mm drill, showing the reticule.

The camera was difficult to focus, being handheld, so the drill image is not that clear - it is VERY sharp when eye viewed.

The difficult part in the construction was getting the microscope sight-line horizontal and in line with the drill point at all focus ranges and zoom settings.

This at lowest zoom setting - at full zoom the 3mm drill fills just over half the image

Then I added a micrometer to the drill grinding stage on the grinder to be able to minutely advance the drill to grind the primary facet - I was using the X slide to do that, but with small drills ( sub 2mm) the movement is difficult to keep fine. The micrometer makes it a doddle!

Makes sharpening drills a pleasure!

Joe

Just to be pedantic 0.1 degree on a wixey type gauge is six minutes.

A 0.1 degree error is only 1.7 thou per inch, or about 3 thou over the width of the gauge.

Neil

Thanks Neil; I'll not worry over 1.7 thou' per inch in what I do

Geo.

Yesterday morning early my daughter was driving to work along the dual carriageway from Guildford to Alton and spotted a car head first into the ditch, obviously been there a little while as the windows were all frosted over.

She phoned 101 and they said yes, they'd had numerous calls re the incident already. So daughter asked if anybody was going to check if anyone was inside. Their reply stunned her. Yes, they said, they would do if they had anyone available, or if they had anyone driving by they would ask them to check it out. Absolutely disgraceful.

So what happens if there is anyone inside unable to summon help themselves? Tough luck it seems, hope they don't die before anyone can be bothered to check.

Moral of the story is, don't get into any difficulty and go off the road, at night and in freezing conditions especially, but if you do, don't expect help to arrive anytime soon.

Welcome to todays not-so-great anymore Britain.

Edited By ChrisH on 11/01/2019 10:30:11

Joseph, I've puzzled about this for a long time. As soon as you grind even the smallest amount off the end of the drill, it's cutting edge is no longer horizontal. Shouldn't you set it so that after a known cut the edge will be horizontal? Of course that implies knowing the helix angle and they are not all the same. I asked DG Brown the same question once and he replied you should set it as I suggest and that you soon learned by experience how much to set it off horizontal.

Duncan, you are quite correct. I try now to do as you say - If the grind is just a 'touch up', I align and grind the secondary facet, and then re- align to do the primary, especially on the drills smaller than 3mm or so. If the drill end is bad, I hack it off-hand to be rid of the chipped parts, etc, then align and grind a secondary, and then re-align and redo the secondary, and re-align and do the primary. It sounds tedious but at least with this microscope jig its quick to align.

I suspect I ( you and I?) are/am being over-fussy, since the many 4-facet jigs built by many folk seem to work ok? gadgetBuilder et-al seem to have working devices and they do not bother with the error. I suspect though they are all just 'sharpening', not regrinding!

I guess it all depends on how much you are taking off of the tip.

Joe

A Scottish couple died after being left unfound in a car which had gone through a hedge a year or two ago.

I saw a car embedded in a fence near where I live in icy weather about a year ago. I stopped and there appeared to be someone hunched over the wheel. I opened the door to find it was an airbag, just as the driver got out the back seat and made me jump out of my skin!

Neil

Spent the day trying to use Turbocad Pro 2018. Took me all day before I could get a pipe flange to look vaguely like the video tutorial said it should. BIgger screen, newer eyes and not being Red/Green colour blind might help.

Colin

Neil - my point entirely re the Scottish couple, tragic we can as a country afford all sorts of vanity projects but not have the funds to properly fund our emergency dervices. Probably two unnecessary deaths there.

Can appreciate your panic when you came across your incident, would scare the life out of most folk, and you being such a sober stoic sort of bloke too!

Chris

About 70% of the membership turned up at EDMES for my talk on collets and adaptors which was reassuring. Plus a possible new member. I forgot to ask if he frequents the forum. Hi Craig if you do.