Spring Tool Holder

[doubleboost]

Hi
Lads
I have found some pictures of a "spring tool holder" I made a while ago
If you watch "oxtools" on you tube he explains there uses
I am doing a video but thought you would like these images
It uses broken 1/4 shank milling cutters for tool bits (plenty of them):yikes::yikes::yikes::yikes::yikes:






















John

[krv3000]

well dun john

[Meldonmech]

  Hi John
                          Nice job, must make one. What is the purpose of the slotted bridge? Have you tried one using a plain square tool holder.

                                        Cheers David

[BillTodd]

 If the lathe is not sufficently  rigid the geometry of machine  tends to bend the cutting edge towards the work under heavy loads.

The hump and slot causes the tool to bend away from the work piece as it loads up, so reducing the tendency to jam when the tool is cutting deep (such as threading or form cutting).

Bill

[mechman48]

I remember using one or two similar years ago when I served my apprenticeship ( fitter/turner.. Lonnnnnnggg time ago     ) we called them 'swan necks' . the idea was , working in a fitting shop with overhead crane trundling along, blacksmith's shop at the end of the shop with the air hammer thumping away plus other machinery etc. there was a lot of vibration coming through the concrete floor, so when we had a particular job that required a fine finish, crankshaft / bearing journals or such like, the spring in the bow or 'swan neck' would absorb & dissipate the majority of that vibration from the tool tip. No doubt Bills comment stand valid as well & I don't dispute any other reason either, just that's my main understanding as I recall..

Cheers
George

[Meldonmech]

   Bill and George

                               Thanks for your explanations.

                                                                             Cheers  David

[Manxmodder]

Hi John,nicely done.   
I've used these at training college many years ago in my apprenticeship days.

I may knock one of these up but I will probably consider using a heat treatable steel to improve the resilience of the spring action.

what steel did you make your one from?  .......OZ.

[doubleboost]

I used "key steel"
It works very well
Even a straight one is a good way of using broken milling cutters
A short video will be coming
John