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Drawbar hammer and drawbars

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jcs0001:
Good work - colour coding is a good idea.

John.

mechman48:
Very nice work. It is rare now for me to use a potential to kinetic energy converter on my WM16 mill as The self ejecting collar works well most of the time, once I feel the MT's pull together I tend to give it a 1/8 - 1/4 turn extra which I find is more than enough, not saying I haven't used the hammer, but very rare now.

howsitwork?:
very nice job.

Must say I still use a lead "adjuster" but only occasionally as made a captive draw bar, which (usually) works.

Like the idea of the thrust washer must give it a go when I use the 3/8 imperial draw bar on mine.

JHovel:

--- Quote from: Arbalist on October 06, 2015, 08:25:45 AM ---..... Mine wasn't though so I made one!

Bottom thread is M12 x 1.75 to fit all my tooling and the top is M14 x 1.25. I suppose it's a bit kinder on the mill but no big deal.

--- End quote ---

Hi Arbalist, can you help me understand your drawbar a bit better?
If I understand your concept, your threaded the other end of the spindle (or it was already threaded for the purpose) at a finer pitch than the tooling tapers? The ejection force is thus generated by the DIFFERENCE in pitch - unscrewing the tool fast than the drawbar fronm the spindle?
That seems very clever!
Could you have a loose nut to tighten the drawbar, independently from the length of the drawar? SOme of my MT4 tooling have a small variation in taper length and drawbar position. I manage that with various spacers and washers at present. But can't quite picture how it will work with an ejecting drawbar....

Cheers,
Joe

Arbalist:
Yes, it's just the difference in thread pitch Joe. I got the idea from Ralph, here:

http://modeleng.proboards.com/thread/5804/mill

Some of my tapers vary a bit in length but I've not had any problems with the operation of this draw bar. It works fine.

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