Marking out

[Vic Perrin]

Don't really know how to word this question but here goes.

I recently watched a demo where the size for a spigot was marked on the revolving timber with a vernier gauge.
I did not get the grasp of the principle of doing this and I have lost the link to the demo.

If anyone understands what I am trying to say HELP please.

Vic

 

[Dalboy]

When using any measuring device for marking like this care is needed. One of the points(whatever you would like to call them) touches the wood in a trailing mode the other is just held clear. The touching one should leave a mark which will show as a circle. when both point line up with the same circle then press a little harder on the one that is touching so you know which one (circle) to use. If you let both touch then whatever device you are using can catch because if one is trailing the other will be pointing into the wood.
Hope this makes sense and answers your question.

 

[Vic Perrin]

When using any measuring device for marking like this care is needed. One of the points(whatever you would like to call them) touches the wood in a trailing mode the other is just held clear. The touching one should leave a mark which will show as a circle. when both point line up with the same circle then press a little harder on the one that is touching so you know which one (circle) to use. If you let both touch then whatever device you are using can catch because if one is trailing the other will be pointing into the wood.
Hope this makes sense and answers your question.

Got it ! thanks Dalboy great explanation.

Vic

 

[Dalboy]

I did forget to say the make sure you do this through an imaginary line through the centre

 

[nev]

I use older 'blunt' ones, that way there's less chance of the point catching

 

[CHJ]

I have not measured a chucking spigot or socket for many years now, once you determine your jaw true circle dimensions they are never going to change.

I use simple marking gauges. which come in useful for marking foot and lid opening guides as well.

 

[Spindle]

Hi

I'm not sure why you would wish to use this method, (unless I've misunderstood - quite likely), you're going to push the jaws of a vernier into the spinning blank, presumably with your bare hands), knowing that there is potential for it to catch and ruin the vernier / your hand, (most verniers have internal nibs which are destined for your palm :shock: )

If I want to scribe an accurately sized hole onto a blank I create a small V shaped recess at the centre of the blank using either a skew or parting tool. This recess then forms the location for one leg of a set of dividers set to the required radius, I can then safely scribe the circumference of the circle with the outer leg of the dividers in trailing mode with no fear of a catch.

Regards Mick

 

[andersonec]

Or,,,,, open your dividers / calipers to the desired dimension, hold the tool 10mm or so away from the work and touch the wood with a pencil with the other hand, once the pencil circle is in line with both points of your tool then you have your required size spigot, press slightly harder to darken the line.

Andy

 

[Richard Findley]

I much prefer dividers for this, they seem easier to control. The couple of times I used verniers for measuring bowl spigots it didn't end well.

Measuring spigots and sizes on a spindle however, verniers (with their sharp points rounded over) are great for this when used with a parting tool.

Cheers

Richard

 

[Spindle]

Hi

For sizing spindles I use callipers and a parting tool - a vernier is 'wrong' ergonomically in my opinion.

Regards Mick

 

[procell]

Why not make a centre mark as described then use an old pair of school compasses with a sharpy pen in the holder. with the lathe stopped you can locate the point on centre than touch the pen to the wood and spin wood by hand.

 

[Dalboy]

Something I am going to make is a wooden template which I have seen which is ideal for both internal and external spigots.

 

[Grahamshed]

Something I am going to make is a wooden template which I have seen which is ideal for both internal and external spigots.

I think that was capt' Eddie. I am making one as well.

 

[Spindle]

Something I am going to make is a wooden template which I have seen which is ideal for both internal and external spigots

Hi Dalboy

Got a link ?

Regards Mick

 

[Grahamshed]

Something I am going to make is a wooden template which I have seen which is ideal for both internal and external spigots

Hi Dalboy

Got a link ?

Regards Mick

Not sure this is the one he means but I think so.
https://www.youtube.com/watch?v=Wa2p8ThEnv0
about 1min 12 sec and rest of video

 

[Spindle]

Thanks Graham

Handy thing to have, (one for each set of jaws).

Do wish he wouldn't leave the chuck key in the chuck though.

Regards Mick

 

[Grahamshed]

I like his videos but the way he points at the screen and says 'watch' grates after a while

 

[Dalboy]

I do not have a link but it was not capt eddie. If you want to see it I will make it in the next couple of day and post a picture. Mind you it is very similar to his.
Mind you why I need to make one as quite often I can judge it about right because I have done it a few times