How does this taper attachment work? Does it attach to the top of your cross slide?
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BaitMaster’s (Work) Bench
- Thread starter BaitMaster
- Start date
BaitMaster
Ultra Member
It bolts to the back of the carriage, then the cross slide bolts to the moving portion with a setup called a draw plate. Set the angle with the screw. Can thread or use power feed, adjust cut depth with the compound.
Precision Matthew’s assures the world that my Liang Dei LD-1236GH is very much different than the PM1236T, however, the manual for the PM-1236T details a lathe and a taper attachment that looks mighty mighty similar to my lathe and my taper attachment.
You can read about the operation of the precision Matthew’s taper attachment in the PM1236T manual on their website.
Mine is supposedly not the same….. but…. It’s the same.
DPittman
Ultra Member
I think the appropriate response here is:
You suck.
Looks quite similar to mine. But I don't see a new dial and a new leade screw.
That suggests that your lathe is already setup with the leadscrew reference at the rear. Mine is at the front and gets moved to the rear when you install the taper parts which include a new cross slide handle (that has no reference anchor) and the new leadscrew which anchors at the rear. You should check that just in case you need more parts.
As to how it works, the lead screw is anchored in the taper attachment. As the saddle moves right or left, the rear anchor follows the taper bar via a dovetail and Gibb. The taper bar is set to the desired taper angle. As the anchor follows the taper bar, it pulls the cross slide forward or backward.
I'll see if I can find an assembly drawing. But it's not intuitive just looking at the drawing.
BaitMaster
Ultra Member
@Susquatch mine is different then yours by the sounds.
See page 24 and 25 in that document.
My lathe is EXTREMELY similar to the PM1236t. If you know what I mean.
See page 24 and 25 in that document.
My lathe is EXTREMELY similar to the PM1236t. If you know what I mean.
Ok, I read the relevant manual info. It works exactly like mine does. It makes no mention of installing a new leadscrew. That tells me that your cross-slide leadscrew is already anchored at the rear and has a slip fit at the front. Before installing the taper attachment, mine has the anchor at the front and slip fit at the back. This make for a very expensive taper attachment for my lathe because you also need a new dial and a new leadscrew.
BaitMaster
Ultra Member
I have to disconnect my cross slide lead screw nut when using the taper attachment. That’s the larger socket hex head bolt in the diagram in the center of the cross slide.
I doubt that. How would you adjust your depth of cut if the cross slide nut is disconnected?
I think you just need to disconnect the taper anchor which then just floats back and forth with the carriage.
BaitMaster
Ultra Member
From PM’s manual:
You adjust with the compound.
You adjust with the compound.
I see. That suggests you have very little range left to cut with. My compound only has a few inches of travel.
BaitMaster
Ultra Member
Mine has 3.5”, however, there is a large adjustment range on the bracket that attaches the cross slide to the taper attachment…. Called the draw plate. See pic….
I see again! I don't have an adjustable draw plate.
By the time we are done we will be redesigning that system.
It's a lot of trouble to go to avoid moving the leadscrew anchor. I read someplace that many modern lathes come with the anchor already at the back to solve this issue.
By the time we are done we will be redesigning that system.
It's a lot of trouble to go to avoid moving the leadscrew anchor. I read someplace that many modern lathes come with the anchor already at the back to solve this issue.
BaitMaster
Ultra Member
It seems like a very high quality fixture, designed for more and harder use then I can imagine it will get with me.
Everything is cast iron. The bearing surfaces are all precision ground. There is even evidence of heat treatment on the dovetail and taper bar, so the fixture is ground and hardened.
The follow rest fits as expected and is made well.
Dealing with LD has been great. I found the prices to be quite competitive for my accessories from them, and I imagine my LD1236GH must be an inferior machine to the PM branded machines if the price has any reflection.
Now I have a tubular workpiece that needs tapering…. And zero excuses to not do it. Crap. lol.
DPittman
Ultra Member
Awesome, that's why you got it wasn't it....to do those fun tubular pieces!?
BaitMaster
Ultra Member
I do love me a fun tubular piece
The jokes just write themselves...I do love me a fun tubular piece
That’s great to hear! If there comes a day when the US company I purchased from is no longer an option for parts it gives me greater confidence my lathe won’t be orphaned.
BaitMaster
Ultra Member
They were very good. I’m sure as long as LD is around, nothing will be orphaned.