For overhang of long components being machined I always use a pair of parallels out board of the vice, and tap down over the parallels! But one of the essentials with a vice is to ‘service’ it to minimise the jaw wobble and lift, check thos gib strips and adjust them with the screw removed to get the moving jaw to slide smoothly with minimum binding. One of my vices is a 4″ Abwood and I always get work seated with the minimum amount of faffing. I always clean it scrupulously on the underside as well as the mill bed (after occasional using a ‘flatting stone’ on the table) before clamping it down. Then I run a 1/10 thou clock to align the fixed jaw and also run it across the bed of the vice to check parallelism to the table.
A trick I learnt as an apprentice was to use a sheet of folded newspaper trapped between the moving jaw and the component being gripped, this was an aid to preventing the job ‘bouncing up’ when tapped down. For a tapping hammer I also always use a lead hammer. The ‘tap’ needs to be just that, not a blow.
As for vices I seem to have collected a variety over the years, these include a 4″ Abwood (as previously stated), a 4″ Edgwick (identical to the Abwood), a 4″ Palmgren (USA made), a 4″ Aciera on a swivel base, another 4″ Abwood on a swivel and tilt base (a brilliant vice for some jobs but with a resultant reduction in headroom). I also have some 3″ vices, which are of unknown origins but are likely to be British or at least European – one possibly a Schuablin. All are likely to be 50+ years old but where necessary they have been reconditioned to clean up ways and new jaws fitted, bases skimmed if any dings were present, drill holes filled with Metalux Cold casting iron epoxy (to the extent that they are visually perfect!). Part of the fun of machining is getting to know the quirks of your tools and finding the best ways to correct any known problems.
If I had to choose any of my vices as a keeper then it would probably be the Abwood or the Edgwick (which I picked up at a junk shop for £15 in a very sorry state – but it did come with the original handle), closely followed by the Aciera which is beautifully made and is really ‘low slung’.
Martin