Hyd-Mech S-20 Series II, Руководство пользователя

Страница: 10 / 59

PG 2.2
BL BL
BL BL BLADE B
ADE B
ADE B ADE B ADE BASICS
ASICS
ASICS ASICS ASICS
Technology is rapidly changing all aspects of production machining. Metal cutoff is no exception.
The advances made in the bandsaw blade industry have definitely brought down the cost per cut, despite
the three fold higher price of the newer technology blades. Variable pitch (see Pg 2.3), bi-metal blades
(like the 5/8 or 4/6 bi-metal blade supplied with the S-20 Series II saws) last much longer, cut faster, and
more accurately than the conventional carbon steel blades. In order to take advantage of the superiority
of bi-metal blades, it is critical to property “break-in” a new blade. This is accomplished by taking two or
three cuts through solid four or five inch diameter mild steel at an extremely slow feed rate. These two or
three slow cuts sufficiently lap (polish) the new blade so that it does not snag the material being cut.
Proper break-in will alleviate blade vibration, improve surface finish and accuracy, and improve expected
blade life.
1. A ne A ne A ne A ne A new b w b w b w b w blade m lade m lade m lade m lade must be pr ust be pr ust be pr ust be pr ust be proper oper oper oper operly "br ly "br ly "br ly "br ly "brok ok ok ok oken-in" en-in" en-in" en-in" en-in". . . . . Proper break-in will alleviate blade vibration, improve
surface finish and accuracy, and extend blade life. The most convenient way to do this is to cut the
intended work-piece, at the standard recommended blade speed for that material, but with the feed
rate reduced to about 25% of normal. Near the end of the first cut, increase the feed rate again, and
once again when the blade approaches the end of the second cut. Keep increasing feed rate in this
fashion, so that normal feed rate is reached after 300 to 500 sq. cm of cutting.
2. Gener Gener Gener Gener Generous coolant a ous coolant a ous coolant a ous coolant a ous coolant applica pplica pplica pplica pplication is essential with almost all ma tion is essential with almost all ma tion is essential with almost all ma tion is essential with almost all ma tion is essential with almost all materials terials terials terials terials. A high quality and well mixed
coolant will dramatically extend blade life, and will increase cutting rate and surface finish. On those
few materials where coolant is undesirable, a slight coolant flow or periodic oiling of the blade is
necessary to prevent the blade from being scored by the carbide guides.
3. TTTTThe stoc he stoc he stoc he stoc he stock being cut m k being cut m k being cut m k being cut m k being cut must be secur ust be secur ust be secur ust be secur ust be securely c ely c ely c ely c ely clamped in the vises lamped in the vises lamped in the vises lamped in the vises lamped in the vises..... Stock movement during cutting will strip
blade teeth. Noticeable stock vibration reduces cutting performance and blade life - consideration
should be given to reorientation of the stock, or additional clamping measures (e.g. wood between
vise jaws and work-piece).
4. TTTTThe pr he pr he pr he pr he proper b oper b oper b oper b oper blade speed f lade speed f lade speed f lade speed f lade speed for the w or the w or the w or the w or the wor or or or ork-piece ma k-piece ma k-piece ma k-piece ma k-piece material m terial m terial m terial m terial must be selected ust be selected ust be selected ust be selected ust be selected.....
Use the following chart as a starting point.
- Blade speeds higher than recommended will quickly dull the blade. Blue chips are evidence of
excessive blade speed.
- Lower than recommended speeds will not prolong blade life, and will require reduced feed rate - but
reduced speeds may be helpful in reducing vibration, and will increase blade life in that case.
5. TTTTThe pr he pr he pr he pr he proper f oper f oper f oper f oper feed r eed r eed r eed r eed raaaaate m te m te m te m te must be a ust be a ust be a ust be a ust be applied pplied pplied pplied pplied. . . . . Feed Rate is the speed which the head "free-falls", and is set
with the feed rate control knob. The head will descend more slowly when the blade encounters the
work-piece but the force of the blade on the work will not be changed unless the setting is changed.
Verification of proper feed rate is provided by the appearance of the cut chips which ideally form
nicely curled "clock springs". (Note that cast irons, and interrupted cuts result in short, broken chips
even at ideal feed rates).
- Excessive feed rate will result in short blade life and/or crooked cuts.