finding the centre of a circle
Moderators: User administrators, Moderators
- Hacksawbob
- Registered user
- Posts: 4443
- Joined: 11 Oct 2005, 07:11
- 80-90 Mem No: 1168
- Location: Lancs UK member 1168
finding the centre of a circle
I had the fun of drilling a few things in my fan this weekend. new mirrors and removing a sheered bolt etc. I got the automatic centre punch pretty close and it worked out OK in the end but I was thinking if I had some hollowed out bolts done on a lathe bored out to take the centre punch it would take the guess work out of it. M8 M10 possibly an M6 (maybe too thin) has it been done already? a good idea?
member 1168
-
- Registered user
- Posts: 521
- Joined: 31 Jul 2010, 21:33
- 80-90 Mem No: 8979
- Location: Liverpool
Re: finding the centre of a circle
I only replied so you would not feel ignored,I have no idea what you're talking about.
Re: finding the centre of a circle
Why were you drilling your fan bob? And why has it got mirrors on it.Dont they stop it revolving
2.1 LPG/Petrol Auto Caravelle
"The difference between genius and stupidity is that genius has its limits"
"The difference between genius and stupidity is that genius has its limits"
- skysurfin09
- Registered user
- Posts: 510
- Joined: 09 Oct 2009, 15:38
- 80-90 Mem No: 2820
- Location: ludgershall wiltshire
Re: finding the centre of a circle
Christ Bob ! You've got to get out more.....
'89 2.1 injected (Digijet)...travelling in hope over adversity
- 1664
- Registered user
- Posts: 8747
- Joined: 30 Mar 2006, 15:20
- 80-90 Mem No: 3299
- Location: Coventry Member
Re: finding the centre of a circle
I know how to find the exact centre of a circle but after the title you totally lost me
so are you still after finding the centre or do I have the wrong end of the stick?
so are you still after finding the centre or do I have the wrong end of the stick?
Vorsprung Durch Technik my ar$e!
- skysurfin09
- Registered user
- Posts: 510
- Joined: 09 Oct 2009, 15:38
- 80-90 Mem No: 2820
- Location: ludgershall wiltshire
Re: finding the centre of a circle
Sticks?..Sticks?... I thought that we were talking studs here.
'89 2.1 injected (Digijet)...travelling in hope over adversity
- Hacksawbob
- Registered user
- Posts: 4443
- Joined: 11 Oct 2005, 07:11
- 80-90 Mem No: 1168
- Location: Lancs UK member 1168
Re: finding the centre of a circle
Sticks and studs may break my bones, but fans can never hurt me.
What you don't have mirrors on your fans?
This might make more sense
http://wiki.club8090.co.uk/index.php/Te ... illing_out
What you don't have mirrors on your fans?
This might make more sense
Centre punch stud face spot bollock centre
http://wiki.club8090.co.uk/index.php/Te ... illing_out
member 1168
- 1664
- Registered user
- Posts: 8747
- Joined: 30 Mar 2006, 15:20
- 80-90 Mem No: 3299
- Location: Coventry Member
Re: finding the centre of a circle
my method won't practically work on something that small in size
Vorsprung Durch Technik my ar$e!
- Hacksawbob
- Registered user
- Posts: 4443
- Joined: 11 Oct 2005, 07:11
- 80-90 Mem No: 1168
- Location: Lancs UK member 1168
- Mocki
- Membership Admin
- Posts: 17008
- Joined: 29 Sep 2005, 09:27
- 80-90 Mem No: 428
- Location: Mansfield Notts
- Contact:
Re: finding the centre of a circle
i have a nut with a tube which the centre punch fits in, which i made up for drilling studs out of a zorst years ago,
have no idea where it is now mind .....
have no idea where it is now mind .....
Steve
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
- Oldiebut goodie
- Registered user
- Posts: 7307
- Joined: 18 Apr 2008, 01:19
- 80-90 Mem No: 11135
- Location: Eastern Angle
Re: finding the centre of a circle
Isn't a fan a Welsh van?
1.6D 2019 VW T-Cross
200hp VW T6
1̶Y̶ ̶1̶9̶8̶7̶ ̶H̶i̶-̶t̶o̶p̶ ̶C̶a̶r̶a̶v̶e̶l̶l̶e̶
5̶0̶8̶d̶ ̶M̶e̶r̶c̶
200hp VW T6
1̶Y̶ ̶1̶9̶8̶7̶ ̶H̶i̶-̶t̶o̶p̶ ̶C̶a̶r̶a̶v̶e̶l̶l̶e̶
5̶0̶8̶d̶ ̶M̶e̶r̶c̶
- Mocki
- Membership Admin
- Posts: 17008
- Joined: 29 Sep 2005, 09:27
- 80-90 Mem No: 428
- Location: Mansfield Notts
- Contact:
Re: finding the centre of a circle
wouldnt that be a llfan?
Steve
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
tel / txt O7947-137911
________________
1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper
- jamesc76
- Registered user
- Posts: 6241
- Joined: 14 Oct 2005, 14:42
- 80-90 Mem No: 1186
- Location: Nottingham
- Contact:
Re: finding the centre of a circle
In my tool box at work I have loads of different sized nuts with washers welded to the top to take my centre pop, works well and i know they will be bob on!
DJ at Dubdayz Summerfest
Now cutting about in an LT35 MWB
Now cutting about in an LT35 MWB
- 1664
- Registered user
- Posts: 8747
- Joined: 30 Mar 2006, 15:20
- 80-90 Mem No: 3299
- Location: Coventry Member
Re: finding the centre of a circle
The widest part of a circle is it's diameter - which MUST pass through the centreHacksawbob wrote:How do you do it on something bigger?
For something large: Get a tape measure, place/fix on one side of the circle and run it out across the circle to the other side.
Keeping an eye on the measurement at the edge, move the tape along the edge of the circle both ways and you will see that the distance decreases the more you move around and away from the exact centre line regardless of which direction you move away from it.
So, get the tape into it's maximum measurement position and the use a pencil to draw a line both sides of the tape measure itself roughly where the circle's centre position is so you have some thing that looks like this equals sign, = ,roughly in the centre of the circle.
Now take the tape and do the same from a position on the edge of the circle 90 degrees round from the first, find the maximum and draw lines both sides of the tape roughly in the centre (which should overlap the previous two lines roughly).
If you just do it twice at 90 degrees to each other you will see a small square where all 4 lines ( 2 x 2 sides of the "tape itself "lines) intersect. Draw straight lines from each corner of the square to it's opposite and where they cross is the circle's centre; so it looks like an 'x' in a box on a voting slip.
The more measurements you take the more accurate it will be, but do it in pairs at 90 degrees to each other and you will end up with more than one 'square' in the middle slightly rotated from each other. Don't panic; just join opposite 'square' corners again and they should all still cross in the same place.
For something small just draw one line along the tape edge but do a few of them and where they all intersect is the centre.
Simples!!
Vorsprung Durch Technik my ar$e!
- kevtherev
- Registered user
- Posts: 18830
- Joined: 23 Oct 2005, 20:13
- 80-90 Mem No: 2264
- Location: Country estate Wolverhampton Actually
Re: finding the centre of a circle
yup
that's how I do it
biggest diameter, two places. intersected
that's how I do it
biggest diameter, two places. intersected
AGG 2.0L 8V. (Golf GTi MkIII)