09-08-2015, 12:36 AM
(This post was last modified: 09-08-2015, 12:38 AM by aRM.
Edit Reason: CORRECTION
)
Dave H ( the other one )
Many appreciative thanks again for this most detailed and informative response. U have presented it descriptively so well that even non-machinists like ourselves could grasp Your mindset and reasonably understand the intricacies involved.
We see where U coming from 'cos although the Keyway in the Quill is fairly wide, I'd say approx 10mm, if we recall correctly, the Key itself is mounted, or rather machined on a +- 30mm Diameter Circular Disc and is only about 25-30mm Long. So what U say is absolutely correct in the negligent amount of force being applied to the Quill under Torque. We totally agree, no doubt a very poor weak design.
Now to enforce and proceed with the correction - that's going to be a little tricky for us, at this point in time. We've already re-assembled the Quill with another, albeit weak Spring, (used to keep the Clamp Lever from 'flopping' back), below the Key, and are a little busy currently processing some immediate (Knife) Orders awaiting Delivery - live centre in Tailstock is used to support some Tang Threading under way.
Allow us to use the machine as is for now and let's see how she goes. U've already given us two options for the permanent solution and for us, methinks the former would be a viable option as cutting another Keyway, (directly below the Quill's) in the Casting, would be much easier. It will also give us a chance in the interim, to carefully control, if not monitor our work procedures on the Tailstock and at the same time assess if there's any untoward behaviour from the unit. We will definitely keep U posted should something go amiss.
Once again, THANK U and
LORD BLESS
aRM
Many appreciative thanks again for this most detailed and informative response. U have presented it descriptively so well that even non-machinists like ourselves could grasp Your mindset and reasonably understand the intricacies involved.
We see where U coming from 'cos although the Keyway in the Quill is fairly wide, I'd say approx 10mm, if we recall correctly, the Key itself is mounted, or rather machined on a +- 30mm Diameter Circular Disc and is only about 25-30mm Long. So what U say is absolutely correct in the negligent amount of force being applied to the Quill under Torque. We totally agree, no doubt a very poor weak design.
Now to enforce and proceed with the correction - that's going to be a little tricky for us, at this point in time. We've already re-assembled the Quill with another, albeit weak Spring, (used to keep the Clamp Lever from 'flopping' back), below the Key, and are a little busy currently processing some immediate (Knife) Orders awaiting Delivery - live centre in Tailstock is used to support some Tang Threading under way.
Allow us to use the machine as is for now and let's see how she goes. U've already given us two options for the permanent solution and for us, methinks the former would be a viable option as cutting another Keyway, (directly below the Quill's) in the Casting, would be much easier. It will also give us a chance in the interim, to carefully control, if not monitor our work procedures on the Tailstock and at the same time assess if there's any untoward behaviour from the unit. We will definitely keep U posted should something go amiss.
Once again, THANK U and
LORD BLESS
aRM