However I have found that this is not necessary if the drilled hole is well centred and the wood of sufficient size to turn to an outside diameter of 22/25mm. If you have a four-jaw chuck, the blank can be mounted in its square condition and the bore drilled before the outside is turned. This should be at least 3mm larger than the final diameter and more if possible. The blank is mounted between centres in the lathe, and turned to the largest cylinder possible. The centre point of each end is then found, centre punched and centre drilled using a No. The wood should be cut to length being sure to keep the ends as square as possible. I usually leave this oversize until the bore has been reamed and I am ready to turn the chanter. Once the chanter is drilled it can be mounted between centres and turned to a full diameter. The tailstock has been removed and the drill can be entered into the starting hole by hand. The "D"bit drill is held in a tap wrench to make the insertion and control easy. The starting hole is machined with a slot drill of the appropriate size - this must be perfectly centred!! The blank is mounted in the 4 jaw chuck and checked to ensure it is running perfectly true. The blank is turned enough to make accurate mounting in the self-centering 4 jaw chuck easy The blank is set up between centres on the lathe ready for the first turning operation The centre drill should be exactly centred on the intersection of the 2 scribed lines both ends. The blank is centre drilled in a pillar drill both ends after centre punching the intersection of the scribed lines The centre of the blank is scribed using a combination centre as shown. The main benefit is that I can use smaller sizes of wood as the full size of the square is available and any run-out of the drilling more easily catered for. I used to turn the blank to a full cylinder before drilling but I now only turn enough to enable mounting in the 4jaw chuck. One change to my method of mounting the blank for drilling has been made possible by the acquisition of a self centering 4 jaw chuck. I am currently making several new sets and taking this opportunity to check the drawings and update the text with better pictures. (8th February 2016) The following section is an update of the original text with new pictures added. Preparing the wood for drones and chanter
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |