This seemed such a brilliant idea,I had to have one!
http://madmodder.net/index.php?topic=2323.0
Although John"blogwitch" wasn't the originator of this idea,he put it in pictures ,so the blindingly obvious became clear to even a dumb cloghopper like me :big:
So,after raiding the jun.............err,carefully thrown in a corner,might come in handy one day pile,a start was made.
I didn't have any angle,so used a piece of T profile I did have.One half of the T base was removed,and then the inside squared.(you did know that the insides of angle and T profiles are not square,didn't you?).A5mm hole was drilled 10mm from one corner,and tapped M6.
Then my piece of 20mm(3/4") plate was split into 2 pieces,one for the toolholder,the other for the piece to be attached to the back of the angle as a way to hold the whole sorry mess in a QC toolholder.after squaring up both pieces,the serious business commenced.
Cutting the slot for the HSS toolbit:
Then 3 holes drilled and tapped M4 for the holding screws:
And here we have the finished toolholder:
A short piece of 1/4" key steel was reduced to 6mm,and a couple of bronze bushes magically appeared out of a drawer:
Then it was on to the stepped bolt to hold toolholder to angle.A piece of 10mm shafting retrieved from an old printer provided the raw material.Threaded M6.
This one actually isn't quite right,so I made another with a shorter threaded portion.
The keysteel locator was drilled and tapped M3,and fitted to the angle.
The following bits I have no pictures of,as the camera battery went flat
The bottom of the toolholder was now blued with my magic marker,and clamped on top of the locator.This allowed me to mark the position for the slot the locator will errm,locate in.
This was first milled out with a 5mm slot drill then carefully widened to accomodate the locator snugly.
Not very visible,but I ground a sort of "lead-in" on the back of the locator so the toolholder would slide into the correct position.
This is of course only neccessary when the toolholder is lifted completely clear,say to measure the thread being cut,f'rinstance:
The remaining piece of 20mm plate was made into a 20 x16mm strip.which is attached to the back of the angle.This allows fitting in the QC holder.
A few minor fiddles included a 13mm spacer between the 2 bronze bearings,rounding the bottom rear corner of the toolholder,and milling a couple of flats on the stepped bolt for a spanner.I was to lazy to set up the rotary table to make it a hexagon bolt head.
After a bit of assembly,this sat on the bench looking pretty:
I've never had the courage to do any single point threading on my lathe,but with this contraption it should be virtually idiot proof.
Tomorrow the acid test.Will it work as good as shown in John's video?Will I finally get to cut a thread ?Will my hat still fit afterwards?
For the answers to these questions,tune in later for the next exciting episode.
http://madmodder.net/index.php?topic=2323.0
Although John"blogwitch" wasn't the originator of this idea,he put it in pictures ,so the blindingly obvious became clear to even a dumb cloghopper like me :big:
So,after raiding the jun.............err,carefully thrown in a corner,might come in handy one day pile,a start was made.
I didn't have any angle,so used a piece of T profile I did have.One half of the T base was removed,and then the inside squared.(you did know that the insides of angle and T profiles are not square,didn't you?).A5mm hole was drilled 10mm from one corner,and tapped M6.
Then my piece of 20mm(3/4") plate was split into 2 pieces,one for the toolholder,the other for the piece to be attached to the back of the angle as a way to hold the whole sorry mess in a QC toolholder.after squaring up both pieces,the serious business commenced.
Cutting the slot for the HSS toolbit:
Then 3 holes drilled and tapped M4 for the holding screws:
And here we have the finished toolholder:
A short piece of 1/4" key steel was reduced to 6mm,and a couple of bronze bushes magically appeared out of a drawer:
Then it was on to the stepped bolt to hold toolholder to angle.A piece of 10mm shafting retrieved from an old printer provided the raw material.Threaded M6.
This one actually isn't quite right,so I made another with a shorter threaded portion.
The keysteel locator was drilled and tapped M3,and fitted to the angle.
The following bits I have no pictures of,as the camera battery went flat
The bottom of the toolholder was now blued with my magic marker,and clamped on top of the locator.This allowed me to mark the position for the slot the locator will errm,locate in.
This was first milled out with a 5mm slot drill then carefully widened to accomodate the locator snugly.
Not very visible,but I ground a sort of "lead-in" on the back of the locator so the toolholder would slide into the correct position.
This is of course only neccessary when the toolholder is lifted completely clear,say to measure the thread being cut,f'rinstance:
The remaining piece of 20mm plate was made into a 20 x16mm strip.which is attached to the back of the angle.This allows fitting in the QC holder.
A few minor fiddles included a 13mm spacer between the 2 bronze bearings,rounding the bottom rear corner of the toolholder,and milling a couple of flats on the stepped bolt for a spanner.I was to lazy to set up the rotary table to make it a hexagon bolt head.
After a bit of assembly,this sat on the bench looking pretty:
I've never had the courage to do any single point threading on my lathe,but with this contraption it should be virtually idiot proof.
Tomorrow the acid test.Will it work as good as shown in John's video?Will I finally get to cut a thread ?Will my hat still fit afterwards?
For the answers to these questions,tune in later for the next exciting episode.
