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Member postings for ColH

Here is a list of all the postings ColH has made in our forums. Click on a thread name to jump to the thread.

1 2 Next > Last >>
Thread: Android app
03/08/2012 01:13:43

Hi David

The problem is not Nexus 7 tablet as it is running the latest version of Android. The problem is the digital reader is out of date and does not support the lastest version of android.

Col

01/08/2012 09:40:12

Hi

I have been trying to download the android app for my Google Nexus 7 but when I click the link it just return to the app page. Anyone else having problem?

Col

Thread: collet holders???
16/01/2012 00:53:45
I too have an FB2 and bought a 2MT ER32 collet chuck and set of collets from CTC tolls and they work well.
 
regards Col
Thread: Letters to a Grandson
03/08/2011 07:59:03
Hi David
 
Has Goeff Shepherd made any progress with the "Leters to a Grandson" ?
regards Col
Thread: Emco Mill bent spindle mystery
12/07/2011 00:10:38
Thanks Ian
 
Usual story - hit the send button and you find what you are looking for. Just like the tool fairys in the workshop who hide a tool until you give up looking and then return it later to a place you had previously searched.
 
Col
11/07/2011 04:51:01
Hi Ian
 
Couldn't find your other thread.
 
What model Mill was it?
 
Col
Thread: Balance Springs
29/06/2010 02:21:49
Hi Sam
 
Check your messages.
 
Col
Thread: New Machining In The Home Workshop Special
27/05/2010 23:22:00
Went to order but there is no detail on postage for outside of the UK.  Are those of us outside the UK going to get postage at the same rate as the UK customers?
Thread: Digital editions of Model Engineer and Model Engineers' Workshop.
14/05/2010 00:49:13
I may have missed something somewhere along the way but I thought at one stage the lastest edition of MEW was made available in digital editions section before it was availabe in the shops and shown on the home page.  I know a few complained about this (I can't understand why as if you don't want to see it early then don't look) but I looked forward to the sneek preview of the next edition before the paper version arrives in my mail box.  Any chance of going back to the way it was?
regards Col
Thread: Latest postings
20/03/2010 22:01:46
Still there but now at the bottom of the page - may as well be gone.

Edited By ColH on 20/03/2010 22:02:12

Thread: Latest uploads of ME
18/02/2010 01:54:00
Another
 
3546 -2 is 3546-1
 
Col
18/02/2010 01:50:18
Hi
 
3650-2 is 3550-2
 
Col
Thread: Minature Ball Races
09/02/2010 02:33:50
Hi Dick
 
How do you mount the bearings?
 
Col
Thread: Cover for a milling machine table
05/01/2010 00:24:25
A friend of mine uses a hand pump pressurised spray bottle - 1 litre capacity used by gardeners for spraying pesticide, available at Garden stores - to provide a steady stream water as a coolant when cutting clock jewels with diamond core drill.  I would assume this would work with suds.
 
Col H
Thread: Minature Ball Races
08/12/2009 08:06:39
Hi John
 
I have not tried them myself but I have a copy of an artlicle by a member of the Sydney(Australia) Clockmakers group.
 
He ran tests to determine the coeficient of friction (CoF) for a couple of types of ball bearings and a conventional polished pivot.  He did the tests on the bearings as received ie had some sort of lubricating oil in them and then washed them out with kero (parafin to those in the UK) or acetone and ran the tests again.  Results were as follows:
 
Plain 1mm pivot - CoF 0.16  dry and 0.22 oiled
Economy 2mm bearing - CoF 0.0044 as received
                                           - CoF  0.0023  washed in kero
Stainless 2mm bearing - CoF 0.019 as received
                                            - CoF  0.001  washed in kero
Economy 5mm bearing - CoF 0.0078 washed in kero
                                            - CoF  0.0014  washed in acetone
 
A US supplier of jewled pivots claimed a CoF of 0.15.  Not much better than a plain pivot but would wear much better.
 
The author also stated that:
 
Results of the Theoretical Study

With plain pivots, and assuming a pivot C of F of .15, and a gear meshing efficiency of 98%, the losses prior to the escapement are 22%, of which the pivots accounted for 14.8%.

If ball bearings are used on all arbors and using a pivot C of F of .005, with a gear meshing efficiency still at 98%, the losses prior to the escapement are 11.6%, of which the bearings accounted for only 3.4%.

If, indeed, the ball bearing C of F is really as low as .001 as some of the tests indicate, then the losses in the pivots would be virtually negligible. So the only losses through to the escape arbor would be due to gear friction, which, at this time, is an unknown quantity even though an efficiency of 98% was assumed.

As I was not the author I cannot comment on the results but they seem reasonable to me.
 
regards  Col
Thread: Latest Digital editions of ME/MEW
07/12/2009 21:53:20
Hi David
 
Following my previous post MEW 158 was taken off Back Issues a week ago and has not re-appeared.
 
btw  my hardcopy arrived in Australia yesterday.
 
Col
28/11/2009 02:11:57
David
I was just flicking through Issue 158  in the back issues and note that page 16 is missing.  This means that the Xmas carol article (pages 30, 31) is not on opposite pages.
 
Col H

Edited By ColH on 28/11/2009 02:12:38

Thread: Ferris Wheel Clock
05/11/2009 07:58:29
Hi Martin
 
Did you do your own drawings to generate the CNC code or did you get Dick's files?
 
Is the finish of the mill good enough or do you need to hand finish?  Are you going to leave the corners round or square them up in the traditional manner?
 
Col
Thread: Case Hardening
25/10/2009 00:15:57
Hi Stephen
 
Can you please run through the multi heat treatment process?
 
thanks  ColH
Thread: Ferris Wheel Clock
22/10/2009 09:46:41
Youra
 
Started in ME Issue 4293 and ended Issue 4308
 
Col
1 2 Next > Last >>
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