MadModder

The Shop => Tools => Topic started by: Meldonmech on August 24, 2013, 07:49:56 AM

Title: Fine Adjustment for a Taper Turning Attachment
Post by: Meldonmech on August 24, 2013, 07:49:56 AM

Hi Guys
              I wanted a fine adjustment facility for my taper turning attachment, and scanned the internet for ideas and discovered there was very little information and even less detail.  I came up with a design and made it in wood just to prove it would work, and avoid damaging all the work I had already completed. see pic 1.  Satisfied with the functioning of the device, I built a micrometer version which gave me 1 thou per division, and fitted it to the underside of the attachment. see pic 2.  A requirement of the design was to make the mechanism free from the ingress of swarf. see pic 3&4.  The top view shows the position of the adjuster and slide locking arrangements see pic 5.  Detail of the adjuster see pic 6&7.  The angular divisions are detailed in pic 8 but the centering register has not yet been engraved.
                    Setting up the attachment and cutting a taper to be continued.
                                                                                                                                Cheers David
                 

Title: Re: Fine Adjustment for a Taper Turning Attachment
Post by: hopefuldave on August 26, 2013, 06:50:45 PM

I thought it looked like my.Holbrook's taper.attachment when you showed the patterns.... The adjustment mech' is close to identical, too :)

The index plate for the angle scale could use a vernier, or.with.a bit of jommetry a turn of the knob could give a nice calibrated increment -the Monarch taper adapter has a sector 'worm wheel' on the end of the taper guide and the adjusting knob rotates the worm - very posh!

Title: Re: Fine Adjustment for a Taper Turning Attachment
Post by: Meldonmech on August 28, 2013, 02:24:37 PM

Hi Dave
                  I have been looking at Holbrook Lathes on Lathes.co.uk.  Is yours the C8 if so I agree my TTA looks very similar. Has yours got the taper per foot markings.
                                                             Cheers  David

Title: Re: Fine Adjustment for a Taper Turning Attachment
Post by: hopefuldave on December 26, 2014, 06:53:18 AM

Excuse really late reply, house move fell through so I've been  temporarily staying with family, no internet out in the sticks....
My Holbrook"s the C13, looks a lot like the C8 Electronic, scaled up a bit, the TTA has an calibrated adjuster and scales at each end of the guide (Sine?) bar, taper per foot one end, degrees/minutes the other, but I still like to check with a reference (e.g. a bought taper between centres) or a DTI/DI on the toolpost and the Trav-A-Dial

Title: Re: Fine Adjustment for a Taper Turning Attachment
Post by: Meldonmech on December 30, 2014, 01:49:22 AM

 
    Hi Dave,  I do exactly the same, set up the taper angle using the fine adjustment, then check with a master ground taper between centers. Then use the D.T.I traversed along the taper to double check. This follows my normal routine of measure twice cut once.
                                                         Cheers David