FILENAMES:

mp1.jpg
mp2.jpg
mp3.jpg
mp4.jpg
mp5.jpg
mp6.jpg

DESCRIPTION:

Pictures of modifications to an asian 3in1 machine to improve the 
milling head mount. Posted by JR North <jasonrnorth@bigfoot.com>. 
Jason provided the following description:

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These pics show my Asian 3in1 Multi-Porpose Machine spindle 
modification to eliminate vertical play and rotational slop 
between the pinion and rack teeth in the mill head.

This involved machining two offset bushings in which to mount 
the downfeed gearbox and return spring housings. The housings 
were turned down .080" to accomodate the offset bushings, which 
have a maximum offset of .060".

A locator slot was milled into the quill, and a locator bolt 
was made by turning the end of a 12x1.75 mm bolt to .200" and 
hardening/tempering. A brass dognose bushing was turned to 
.250" OD and reamed for a light press fit onto the locator 
bolt. This dognose bushing engages the slot in the quill, 
eliminating rotational play of the quill in the mill head.

MP1.jpg shows an offset bushing mounted in the mill head
MP2.jpg shows milling the locator slot in the quill
MP3.jpg shows the downfeed gearbox, the return spring housing, 
        and the two offset bushings
MP4.jpg shows milling an .500" flat into the downfeed rack teeth
MP5.jpg shows tapping the headstock for the locator bolt
MP6.jpg shows the locator bolt with brass dognose bushing

JR North