Rear tool post WM250 VF

[Rik ShawParticipant @rikshaw]

[Rik ShawParticipant @rikshaw]

Just finished my version of a rear tool post for WARCO WM250 VF. Riser block made from the stop from a scrap conveyor belt. There are some small tapped holes that were already there and my machining has broken through into them, they'll make great greaseways . Fitted with original tool post (up to now in storage as I now use QCTP). Bracing span from 10mm ally angle – only had one bit in scrap box that was big enough, phew!!

Tried to use a spring and 1/2" ball bearing to act as a detent on the four 90 degree positions but it did not work so reverted to the WARCO method of a spring loaded plunger with tapered top and slotted guide way – that works OK.

I suppose I could have ordered a WARCO spare replacement handle to hold the whole lot down but I kept my money in my wallet and made one.

Rik

Edited By Rik Shaw on 19/03/2014 17:52:18

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[mechman48Participant @mechman48]

Here's one I made earlier ( 2012 ) .. from a Hemingway kit

Establishing centre height..

Tool post prior to machining..

Most of the machining done..

Blade set at 7* angle as per Hemingway drawing instructions..

This proved to be unsuitable as the amount of blade extended to maintain centre height resulted in too much flexing of the blade resulting in convex/concavity of the parted off item faces , so resorted to turning the block 180* & using a commercial tool holder which gave a much more rigid setup, eliminated the concavity/convexity, & allowed some degree of adjustment for centre height..

example of washer parted off.. under power feed too! IIRC approx 200 rpm, min feed rate as on crossfeed chart..

My golden rules for parting off.. rigidity.. minimum blade extension.. plenty of lubrication,  for everything except brass.. even then?  .. don't stop feeding in whether by hand or power feed.. blade tip on exact centre height, oh & lock the saddle too. Have since put a small angle on blade to eliminate remaining ring ( on washer ) this allows the leading edge of the blade to break through first on ID.

Some other interim pics of parts / machining in my album.. 'Rear tool post'..

Cheers

George.

Edited By mechman48 on 19/03/2014 20:23:52

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