Thread Dial Indicator positions

[NobbyParticipant @nobby]

Hi Tel
Looked at the link .Brilliant
Nobby

[John Stevenson 1Participant @johnstevenson1]

Another thread here on another board that covers the same tool and some variations on it by others.

links to video's as well.

**LINK**

John S.

[NobbyParticipant @nobby]

HI John
Thank for posting a link . It all makes sence now .
Nobby

[M0BNDParticipant @m0bnd]

I like this idea, I have seen it before but never a video and understood the concept of how it works.

It reminds me of the clapper box mechanism on a shaping machine.

[Terry LaneParticipant @terrylane]

Exactly the same principal as the clapper box.

[John Stevenson 1Participant @johnstevenson1]

Still one of those "Dur why didn't I think about this moments"

Must admit I'm hooked now, don't thread any other way and I do a lot of threading. Even sizes where I have dies I screwcut and then clean up afterwards with a die.

I have three interchangable tools, one ground at 60 degrees for metric, one at 55 for Whit and one to hold a Coventry die insert.

John S.

[_Paul_Participant @_paul_]

It's a wonderful piece of equipment threading is a real pleasure to do now and takes less than half the time.

My thanks to Bogstandard and everyone else who contributed in it's design.

I now need to improve my "timing" as I use mine on an old A series Boxford powered by a 1/2 horse 3 Phase and a Teco inverter making sure it stops/reverses before it hits the chuck can be "interesting".

The threaded chuck means I cant use the Teco inverters DC braking to it's full effect.

I did consider fitting the machine with a micro switch running as an e-stop so when it approached the end of it's run it stopped automatically.

What I would like to do though is a variation on the above so that it stops and then reverses direction automatically I imagine it would be a case of selecting the correct switchgear to emulate the E-stop (N/C switch) , then effectively passing through the off position (thus clearing the e-stop) and then into reverse.

[M0BNDParticipant @m0bnd]

Posted by _Paul_ on 06/06/2012 18:13:58:

It's a wonderful piece of equipment threading is a real pleasure to do now and takes less than half the time.

My thanks to Bogstandard and everyone else who contributed in it's design.

I now need to improve my "timing" as I use mine on an old A series Boxford powered by a 1/2 horse 3 Phase and a Teco inverter making sure it stops/reverses before it hits the chuck can be "interesting".

The threaded chuck means I cant use the Teco inverters DC braking to it's full effect.

I did consider fitting the machine with a micro switch running as an e-stop so when it approached the end of it's run it stopped automatically.

What I would like to do though is a variation on the above so that it stops and then reverses direction automatically I imagine it would be a case of selecting the correct switchgear to emulate the E-stop (N/C switch) , then effectively passing through the off position (thus clearing the e-stop) and then into reverse.

If you are worried about retracting in time, why not place a thumb lever behind the tool (attached to it) and depress when near to the end of the thread? This way the tool would be forced upwards and out the way before it got to the chuck? Just an idea of course??

Andy.

[NobbyParticipant @nobby]

Hi Tel & guys
I thought the same as Andy . some sort of lever/ handle would help. Is there a video somewhere that we could actualy see it working
Nobby

[NobbyParticipant @nobby]

Hi John
Watched link/video Brilliant . as been said its like a clapper box on a shaper. I have always been concerned about backlash on the leadscrew when reversing back. I will have a go at making one
Talk about paint drying I have just painted the door on my shed/ workshop
Nobby

[Terry LaneParticipant @terrylane]

Well don't keep us in suspenders – what colour?

[NobbyParticipant @nobby]

Hi
Green
Nobby

[chris stephensParticipant @chrisstephens63393]

Hi Guys,

For thse of you who like the idea of a self lifting/clapper box/swing up tool holder have you seen the You Tube videos of what may be the original idea? If not may I suggest that you take a look at the following,

**LINK**

**LINK**

**LINK**

The first one was up loaded in June '09, some months before the excellent series by Bogs, but I cannot speculate as to whether this was before Mr M. Cox proposed his version, which Bogs perfected.

The German version is a piece of p*ss to make and works well. There is enough information to be had from the videos to make your own, well there should be enough there for any one who calls them self a model engineer, the only part that is not blatantly obvious is that the cutting tip should be above the height of the pivot point. This design point is common to all the various versions as it encourages the tip to move back slightly as the tool lifts.

chriStephens

Edit, you will note that in the videos the top slide is set parallel to the lathe axis, but he still manages to get a good thread!

Edited By chris stephens on 08/06/2012 13:15:51

[Clive HartlandParticipant @clivehartland94829]

I notice that he is using those excellent 'Multiquick' quick change toolposts.

All the Schaublin lathes we had used them.

Clive

Edited By Clive Hartland on 08/06/2012 13:49:06

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