Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 106 to 120 of 132
Thread: Cylindrical Square
-
10th November 2011, 08:11 PM #106SENIOR MEMBER
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 2,659
-
10th November 2011 08:11 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Age
- 2010
- Posts
- Many
-
10th November 2011, 08:14 PM #107SENIOR MEMBER
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 2,659
-
10th November 2011, 08:14 PM #108I break stuff...
- Join Date
- Aug 2010
- Location
- Melbourne
- Posts
- 539
Not at all. But this discussion helps people to get a better understanding of whats going on, and in this case might save someone time on their setups in future. If the result had gone the other way, it could have saved someone a lot of time trying to work out why they were ending up with a taper. Does that bother you, that people like to understand what's going on and improve their abilities as a result?
-
10th November 2011, 09:02 PM #109Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 4,304
-
10th November 2011, 09:19 PM #110GOLD MEMBER
- Join Date
- Jun 2007
- Location
- sydney
- Age
- 65
- Posts
- 3,566
Dosent bother me at all,but I think its a bit of overkill,the way itas going it would take an apprentice 6 to 8 weeks to cover all the scenarios about turning between centres,and still not sure if they would understand what they have done.
But then again I am just a practical person and not overly involved with the theoretical side of pedantics.
-
10th November 2011, 10:03 PM #111SENIOR MEMBER
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 2,659
-
10th November 2011, 10:29 PM #112
-
10th November 2011, 10:34 PM #113Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 4,304
-
10th November 2011, 10:37 PM #114GOLD MEMBER
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 7,775
-
10th November 2011, 10:49 PM #115SENIOR MEMBER
- Join Date
- Sep 2011
- Location
- Ballarat
- Age
- 65
- Posts
- 2,659
-
11th November 2011, 10:57 AM #116GOLD MEMBER
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 7,775
Last night I turned up a cylinder square.
0.1mm taper. repeatable within 0.01mm with a 0.04mmdoc.
I then moved the center by 1mm.
Three cuts later(the dog wasnt up to much as far an intrupted cuts went).
0.1mm taper(yes the same way). repeatable withing 0.01mm with a 0.04mmdoc.
Must run
Stuart
-
11th November 2011, 02:50 PM #117Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 4,304
Thanks for clearing that up Stuart...
Now lets put the tailstock out of alignment and see what happens...Light red, the colour of choice for the discerning man.
-
11th November 2011, 07:19 PM #118I break stuff...
- Join Date
- Aug 2010
- Location
- Melbourne
- Posts
- 539
My brain hurts when I try and visualise this setup for too long. Ending up with the parellel result once depth of cut exceeded headstock offset was easy to grasp, but I managed to confuse myself about what happens along the way.
Do I get partial credit if I say it's sort of a taper? A kind of squashed, lopsided.... ah, forget it.
-
12th November 2011, 10:21 AM #119GOLD MEMBER
- Join Date
- Aug 2011
- Location
- Melbourne
- Posts
- 2,951
As a newbie to metal turning, I'm watching this thread with interest and amuzement. It's not always easy sorting out the crap from the good stuff but it's still fun to read!
I have a metal turning book by Harold Hall and one of the projects in there are a set of cylindrical squares. He says not to use the tailstock because even the most accurate machines will have tailstock alignment problems which will be enough to affect the overall accuracy (parrallelism of the cylinder) of the job.
So I guess my question is, if you don't need to use the tailstock to turn up a set of cylindrical squares, why use it? Surely it just adds an extra unwanted potential complication? I'm am kinda assuming this discussion is purely for the sake of theorising...
Cheers,
Simon
-
12th November 2011, 10:35 AM #120
I think that Harold Hall was pitching his books to a modest home shop/model engineering audience. Not many lathes available to the hobbyist had offset adjustable tailstocks, nor was there a ready supply of good yet cheap metrology tools.
You'd have a hard time turning a useful cylinder unsupported, and temperature growth and tool/work springiness would be a bigger potential error source I would think.
Making workshop standards and metrology aids is probably the most challenging task for a machinist if your goal is to end up with a tool that is ten times more accurate than the most accurate job it'll be called upon to measure.
Someone will chime in soon with the objection that this only applies in climate controlled, clean workshops. To which my reply is "Yes". Air conditioners and vacuum cleaners are cheaper than the other tools in the shop by far.It's all part of the service here at The House of Pain™
Similar Threads
-
Cylindrical cabinet
By 3 toed sloth in forum WOODWORK - GENERALReplies: 19Last Post: 2nd January 2009, 02:35 PM -
Cutting cylindrical holes.
By Timmm in forum WOODWORK - GENERALReplies: 11Last Post: 6th July 2007, 07:32 AM -
Make your own cylindrical sander
By rsser in forum WOODTURNING - GENERALReplies: 15Last Post: 27th August 2006, 09:59 PM -
Making a round / cylindrical box
By samueolchoo in forum WOODWORK - GENERALReplies: 2Last Post: 29th April 2003, 10:14 AM