Supporting > Tooling & Machines
Help with milling issue
Chipswitheverything:
For work within its scope of size the Abwood vice should be excellent : I have a similar one that I bought new, very many years ago, and I can rely on it for precision.
A few years back, I inherited from another model engineer a 4" jaw far Eastern manufacture machine vice of the general format of your vice. Quite substantially made. When I checked it over, a lot was wrong with it!
So I treated it a bit like a set of castings, and remachined and re-fitted a lot of surfaces, re did the jaw seatings which were all over the place. Re machined the moving jaw guideways and the gibs that hold down the jaw, so the lifting tendency has been eliminated. Filed and scraped the base of it flat, and re-did the tongue and groove for the ( new) tabs to fit snugly into the milling table slots.
After this, I have found it to be a good and useful vice!, no prettier appearance wise, but I can rely on it for holding with decent accuracy. So at some time it might be worth seeing if a 'fluence could be worked on your vice ... Dave
Charles Lamont:
As I usually do at about this point in a discussion involving milling vice jaw lift, I will throw in the use of "pull-downs" for getting accurate parallelism. These are strips of material with bevelled edges used between jaw and job to exert a downward force on the job. It may look a precarious arrangement, and it can be a bit of a pain to set up, but it works well. I often use just one on the moving jaw side. The sketch show two types. I prefer the one with the V on one side as being easier to set up.
Jasonb:
Charles, How are those with the softer material like aluminium or in this case GM/Bronze? Is there a chance of the narrow contact area marking the work?
Charles Lamont:
Yes they will mark a softer workpiece, but getting the two largest faces parallel is often the first task, before finishing the sides.
dieselpilot:
At that angle the reading on the dial indicator must be corrected for cosine error. The stylus should be parallel to the surface for that model, if the reading is to be used directly.
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