VICMARC VM120/150 Dovetail Jaws
Dovetail Jaws have been designed for mounting bowls by expanding into a recess or clamping onto a spigot.
The sizes indicated on the drawing show the Jaw measurements at a perfect circle. VM120 and VM150 chucks provide approx. 48mm of expansion beyond these specified sizes shown with the exception of the 85mm and 105mm Dovetails (see below). All Dovetail Jaws have an internal dovetail angle of 13 degrees for clamping and an external dovetail angle of 13 degrees for expanding.
The Vicmarc range of Dovetail Jaws also have a machined taper on the face of the dovetail which aids in clamping both on a tenon (clamp mode) and in a recess (expansion mode). When clamping on a tenon it is often the case that the flat section of the bowl/tenon will be tapered the wrong way slightly or may have wood fibres or debris that can be in the corner of the tenon. With the jaws being slightly tapered it allows for a firm and accurate hold slightly away from the corner. This will ensure an accurate hold without wobble. When clamping in a recess the flat section is often tapered towards the centre of the bowl. This taper allows for a firm hold right in the corner (outermost diameter) which will ensure an accurate hold.
There are 7 options. (see images)
Description Dim A Dim B Dim C Part No.
Dovetail 85mm 63mm 85mm 12mm V00675
Dovetail 105mm 84mm 105mm 12mm V00676
Dovetail 128mm 106mm 128mm 14mm V00677
Dovetail 148mm 126mm 148mm 14mm V00678
Dovetail 173mm 150mm 173mm 16mm V00679
Dovetail 198mm 175mm 198mm 16mm V00680
Dovetail 223mm 200mm 223mm 18mm V00682