06 May. 1977|
Homemade lathe taper attachment,kitchen nook bench seating plans,solid wood bunk bed plans,basswood tree - For Outdoors
I just finished making a taper attachment for my SB10K if anyone wants to see it join my SB10k group. If I may comment objectively without the comments being taken as throwing darts at your design, I wondered about the performance of your taper attach in actual use.
The extra distance between supports and reduced moment of inertia on the solid rod as compared to a rectangular flat bar could potentially result in some non-flat tapers if the setup flexes slightly during machining.
A number of modifications to the top slide have been shown in an earlier section that improve the cutting of tapers on the minilathe. This photo shows the attachment clamped to the lathe bed and set up for cutting an MT2 Morse taper.
I've known of used Taper Attachment being installed and not working properly with out re-babbitting the bed clamp.
However any taper longer than about 80 mm is beyond the capacity of even the modified top slide.
A plate with a pivot pin was clamped in the lathe toolholder and the swivel plate placed over the pivot pin as shown in the photo. It lowers the base plate by 6 mm, it provide a place for marking the index line against which the graduations are read and the end of the spacer is also used to set the distance of the base plate from the lathe way.
Note on the left hand side of the unit the spacer between the clamping bar and the base plate has been pushed hard against the back edge of the lathe way. Turn a couple of tapers using the compound, and then set the taper attachment to follow them. Mounting and dismounting such a unit is difficult since access to the rear of my lathe is limited.
The following criteria were used as a basis for the design of the taper attachment descibed here:1. The swivel plate is free to rotate on the pivot plate and as the tap cuts then the plate moves round following the pitch of the tap.
Now clamp the attachment roughly parallel to the lathe bed making sure that the end of the spacer is in contact with the back edge of the rear way. It differs from other published designs in that it attaches directly on top of the lathe bed ways and that it incorporate a worm to adjust the taper angle.The header picture shows the completed unit.
Remove the feed screw from the cross slide.On a standard lathe this can be done by removing the handle and graduated collar.