Metal-cutting band saw OPTIsaw S275NV vario

The OPTIsaw S275N is the most in-demand and most popular metal-cutting band saw in the entire band saw range of the Optimum brand.

This popularity was the Optimum OPTIsaw S275N metal-cutting band saw has earned for good reason.

Technical description:

• High build quality, ease of use and a moderate price are its main advantages.
• Swivelling the saw frame up to 60° allows the cutting angle to be changed quickly and easily with almost no loss of working time, while maintaining high cutting accuracy with no saw vibration whatsoever.
• Structural rigidity and cutting accuracy are ensured by the heavy cast iron frame.
• Smooth lowering of the saw frame during cutting is achieved by a correctly matched counterweight and the flawless operation of the band saw's hydraulic cylinder.
• At the end of the cut, the automatic limit switch trips and the saw frame returns to its initial position.
• For accurate cuts, five pairs of roller guides keep the saw blade on its set path.
• The coolant system delivers coolant precisely to the cutting zone, effectively cooling the blade and flushing away metal chips.
• The two-speed motor on the OPTIsaw S 275N metal-cutting band saw allows cutting at 45/90 m/s, while on the OPTIsaw S275N Vario, thanks to the variator, cutting speed is steplessly adjustable from 20 to 90 m/s.
• The quick-clamping vise allows a large volume of work without losing time when changing workpieces. This is especially important when making many identical cuts.
• Particularly worth noting is the comfort of working with the band saw: a simple, convenient control panel, quiet operation and a blade tensioning system that even a "beginner" understands are the keys to the popularity of the Optimum band saw.

Main features:
Quick-clamping vise.	Feed rate adjustment with a back-pressure hydraulic cylinder.

Specifications:
Band saw model	OPTIsawS 275N	OPTIsawS 275NV Vario
Item No.	3300260	3300265
Power supply
Motor	1.1 kW / 380 V	1.5 kW / 220 V
Coolant pump	40 W	50 W
Machine data
Max. cutting diameter, round stock, 90°, mm	225
Max. cutting size, rectangular stock, 90°, mm	245 x 180
Max. cutting diameter, round stock, 45°, mm	160
Max. cutting size, rectangular stock, 45°, mm	160 x 160
Max. cutting diameter, round stock, 60°, mm	100
Max. cutting size, rectangular stock, 60°, mm	100 x 100
Saw blade size, mm	2480 x 27 x 0.9
Cutting speed, m/min	45 / 90	20 — 90 stepless
Overall dimensions
Length with vise closed, mm	1360
Length with vise open, mm	1630
Width without workpiece stop	510
Width with workpiece stop	1140
Height in lowest position	1420
Height in highest position	1690
Machine weight, kg	185	200

Scope of delivery:

1. Bimetal saw blade.
2. Workpiece stop.
3. Quick-clamping vise.
4. Machine stand.
5. Limit switch.
6. Operating manual in Russian.

OPTIONAL ACCESSORIES		ITEM NO.
Roller conveyor MSR4		3357610
Roller conveyor MSR7		3357611
Roller conveyor MSR10		3357613

Metal-cutting band sawswith similar specifications are available from Proma (Proma PPS 220), Zenitech (Zenitech BS 225, Zenitech BS 220), JET (JET HBS-916W, JET HVBS-912,JET MBS-910CS), FDB machinen (FDB SG260HD, FDB SG 5020).

Each of the models listed above deserves attention, but the OPTIsaw S 275N metal-cutting band saw, and especially the OPTIsaw S 275NV vario, compare favourably with competitors. Some competing models are much more expensive than the OPTIsawS 275G, others have weak (fragile) assemblies, others lack a swivelling saw head or vise, and some fall short on cutting accuracy. Cutting accuracy, reliability and ease of use, a quick-clamping vise and a speed variator combined with a reasonable price are the factors behind the market success and popularity of the OPTIsaw S 275N and S 275NV vario.

Recommended band saw cutting parameters.

1. Clamping workpieces
   Clamp workpieces so as to eliminate blade vibration as far as possible. This increases productivity and tool life.
   In some cases, when cutting a bundle of workpieces, it may be advisable to tack-weld the workpieces together

1. Cooling
   Active cooling of the cutting zone with coolant helps avoid overheating of the tool and workpiece and clears chips from the cutting zone. Coolant emulsion is usually used when cutting steel; cast iron is most often cut without it (dry). Coolant is most effective when cutting structural, tool and alloy steels, titanium and nickel alloys.
2. Cutting speed and feed
   Cutting speed depends on the hardness, type and cross-section of the workpiece. The stronger the workpiece material, the lower the cutting speed should be. Workpieces with a smaller cross-section can be cut faster than those with a large cross-section. Tubes and profiles are cut at low speed, and a constant feed is very important. If vibration occurs, change the cutting speed up or down by the smallest possible amount. As the tool dulls, the feed is increased.

Steel grade	Cutting speed, m/min (M42)
Structural / free-cutting	80 — 90
Heat-treatable	45 — 75
Unalloyed tool / bearing	40 — 60
Alloyed tool / high-speed	30 — 40
Stainless	20 — 35
Heat-resistant	15 — 25

Table for checking cutting parameters by the type of chips produced
	Fine or powdery chips — increase the feed
	Loosely curled chips — the cutting speed is set correctly
	Thick, heavy or blue chips — the cutting speed is too high

1. Tooth pitch
   Blades with variable tooth pitch 1.5/2, 2/3, 3/4, 4/5, 4/6, 5/6 and a 10° rake angle are best for cutting solid workpieces of high-quality high-alloy steels and produce long chips. For such workpieces these blades give the cleanest, highest-quality cut.
   For tubes with a wall thickness of up to 8 mm, blades with a 0° rake angle give the best results.

Recommended tooth pitch for solid workpieces
Constant tooth pitch		Variable tooth pitch
Workpiece cross-section, mm	Tooth pitch, Z	Workpiece cross-section, mm	Tooth pitch, Z
up to 10	14	up to 25	10 / 14
10 — 30	10	15 — 40	8 / 12
30 — 50	8	25 — 50	6 / 10
50 — 80	6	35 — 70	5 / 8
80 — 120	4	40 — 90	5 / 6
120 — 200	3	50 — 120	4 / 6
200 — 400	2	80 — 180	3 / 4
300 — 700	1.25	130 — 350	2 / 3
over 600	0.75	220 — 600	1.5 / 2

Recommended tooth pitch for cutting tubes
Wall thickness, mm	Tube diameter, mm Tooth pitch, Z
		20	40	60	80	100	120	150	200	300	500
2		14	10 / 14	10 / 14	10 / 14	10 / 14	8 / 12	8 / 12	8 / 12	8 / 12	5 / 8
3		14	10 / 14	10 / 14	8 / 12	8 / 12	8 / 12	8 / 12	6 / 10	6 / 10	5 / 8
4		10 / 14	10 / 14	8 / 12	8 / 12	8 / 12	6 / 10	6 / 10	5 / 8	5 / 8	4 / 6
5		10 / 14	10 / 14	8 / 12	8 / 12	6 / 10	6 / 10	5 / 8	4 / 6	4 / 6	4 / 6
6		10 / 14	8 / 12	8 / 12	6 / 10	6 / 10	5 / 8	5 / 8	4 / 6	4 / 6	4 / 6
8		10 / 14	8 / 12	8 / 12	6 / 10	5 / 8	5 / 8	4 / 6	4 / 6	4 / 6	4 / 6
10		—	8 / 12	6 / 10	4 / 6	4 / 6	4 / 6	4 / 6	4 / 6	4 / 6	4 / 5
12		—	8 / 12	6 / 10	4 / 6	4 / 6	4 / 6	4 / 6	4 / 6	4 / 6	4 / 5
15		—	8 / 12	6 / 10	4 / 6	4 / 6	4 / 6	4 / 6	4 / 5	4 / 5	4 / 5
20		—	—	4 / 6	4 / 6	4 / 6	4 / 6	4 / 5	4 / 5	4 / 5	3 / 4
30		—	—	—	4 / 6	4 / 6	4 / 5	4 / 5	4 / 5	4 / 5	2 / 3
50		—	—	—	—	—	—	4 / 5	3 / 4	2 / 3	2 / 3

1. Saw blade width
   It is recommended to use blades of the maximum possible width. The wider the blade, the more stable the operation at high feed rates. When cutting curves, blade width limits the minimum cutting radius.

Radius, mm	3	8	15	30	38	65	100	140
Blade width, mm	3	5	6	8	10	13	16	20