Thread: Bugger! Did it again!

Originally Posted by Michael G

Peter, what are you looking for? ISO40 boring and facing? Any restrictions? Now that Bob has his I guess I can spot for someone else (an excuse to look)

Michael

Yeah, 40 taper. Don't care if it's SK40, BT40, ISO40 whatever, I've already made adaptors for all of them!

Can't see that I'll ever need to do a bore bigger than say 75mm with the cutter shank parallel with the arbor (ie not sticking out the side). Ideally facing as well as boring, if I had it I'd use it. Restrictions - reasonable quality & cheap of course. I'm aware of the 'good, cheap, fast - pick any 2' rule and there's no hurry (because right now there's no budget either!).

I have a B/port boring head but it's on a 1/2" parallel arbor and frankly it isn't great. 2" bore is its limit. I've got by with it but you need to check everything multiple times. Too much flex in all the components. A small boring head came with my latest mill, haven't looked at it closely but I think 40mm would be its limit.

These days I find I'm working in the 50mm to 100mm dia work range far more than say the 0 to 50mm range and often bigger than 100mm. Recently doing tapered roller bearing housings for my propellor shaft thrust setup so pretty close tolerances.

Just collected a 0-25mm Mitutoyo electronic mike with resolution to 0.0001mm while I was in Sydney. It's a nice unit - Ebay purchase - but it wasn't what I'd actually bought! Oh well, too late to do anything about it as I bought it in August (but it didn't arrive before I left) and I'm sure I'll use it. Now to go back to searching for a 25-50 and a 50-75mm mechanical digital mikes which is what I actually wanted. I dislike (while appreciating the advantages) electronic measuring gear.

PDW

Originally Posted by PDW

Just collected a 0-25mm Mitutoyo electronic mike with resolution to 0.0001mm while I was in Sydney.

wow 1/10th of a micron...

Originally Posted by .RC.

wow 1/10th of a micron...

I could say I did that deliberately to see who was the biggest pedant on the site (your prize is in the mail but I've lost the tracking number) but in fact I made a typo and when I thought about it later, I decided to leave it and see what'd happen.

Now to go back to searching (lackadaisically) for Mits mechanical digital mikes in metric & inch.....

PDW

Originally Posted by PDW

I could say I did that deliberately to see who was the biggest pedant on the site (your prize is in the mail but I've lost the tracking number) but in fact I made a typo and when I thought about it later, I decided to leave it and see what'd happen.

Now to go back to searching (lackadaisically) for Mits mechanical digital mikes in metric & inch.....

PDW

I knew that...was just testing you to see if you'd own up to a typo....

Originally Posted by PDW

I could say I did that deliberately to see who was the biggest pedant on the site (

I was not being pedantic, I was just exclaiming surprise as I had not seen a 0.0001mm micrometer...

Originally Posted by .RC.

I was not being pedantic, I was just exclaiming surprise as I had not seen a 0.0001mm micrometer...

I was thinking the same thing but didn't have the confidence or knowledge to know whether they actually exist or not! Any more accurate and you would have to re-name them a Nanometer!

Simon

Originally Posted by .RC.

I was not being pedantic, I was just exclaiming surprise as I had not seen a 0.0001mm micrometer...

Here you go.... MDH Micrometer High-Accuracy Sub-Micron Digmatic Micrometer

Regards
Ray

PS... I thought PDW had lashed out and bought one..

Originally Posted by RayG

Here you go.... MDH Micrometer High-Accuracy Sub-Micron Digmatic Micrometer

Regards
Ray

PS... I thought PDW had lashed out and bought one..

Not likely. I think even a 1 micron micrometer is a joke outside a temperature controlled room. Let's see, it was over 35C yesterday, it's about 16C today, wonder how repeatable any measurements at the micron or below precision are.....

Having said that I'm sure I'll use this one even if I did end up with it by mistake. I try to avoid working to finer than 0.01mm but sometimes there's no real choice.

Back on boring heads, I wonder just how accurate the description (let alone the manufacturing) is on this item because it doesn't look like a head with facing capability to me....

Precision Boring Facing Head ISO 40 Shank NEW Micro Boring Head INT 40 Shank | eBay

PDW

I think your right there and someone going off the description will be disappointed

Going by memory Eskimo got a good buy on a boring facing head for around 550 through tiawon tools.

Originally Posted by RayG

Here you go.... MDH Micrometer High-Accuracy Sub-Micron Digmatic Micrometer

Regards
Ray

PS... I thought PDW had lashed out and bought one..

you know i believe the measuring equipment used to reach and land on the moon as well as return back to earth
was no were near that accurate.
aaron

Originally Posted by azzrock

you know i believe the measuring equipment used to reach and land on the moon as well as return back to earth
was no were near that accurate.
aaron

Hi Aaron,

There was a documentary on tv a while back called "moon machines" if I remember it correctly, and some of the stuff they built back then was machined to tolerances in the millionths of an inch. They probably couldn't build a Saturn 5 rocket today, ( apart from the fact that the plans were lost) you would have to get the Chinese to do it.

And Joseph Whitworth had a machine that measured with an accuracy of 1 millionth of an inch way back in 1840.. ( 0.025 micron )

Regards
Ray

hi ray. really. just shooting my mouth off again