The Pull-Down bandsaw
By Ben Fuschino
HydMech Group Limited
In the past, when one thought of a pull-down bandsaw it automatically brought
to mind a cheap, flimsy machine that would never be suitable for any production
operation. Well, times have changed. However, to better understand the pull-down
it is better to define this type of machine. Simply put, these machines are typically
smaller bandsaws that sit up on a pedestal base and usually mitre and often
mitre both left and right. The pull-down means that rather than have a feed cylinder
these bandsaws are pulled through the cut by means of physical force. That is,
the operator literally pulls the head down through the material.
The new European models, such as the DM line being imported from MEP by HydMech
Group Limited, offer a robust production-oriented solution. While these tend
to be smaller capacity machines, usually under ten inches, they make up for their
diminutive size with design and components. Features such as all cast iron heads
and vises and table bases make the Euro pull-down bandsaws very rigid and robust.
The other differentiating factor with these particular bandsaws is that they
use carbide pads to ensure blade alignment through the cut. This means that the
blade is held tightly and avoids deflection when cutting.
In the more traditional machines, the blade is aligned through round bearings.
These do not offer the support that carbides do and also tend to wear faster.
The by-product of this is sloppy tolerances and bad production results. One other
feature that also assists in the cutting process is the presence of cutting fluid.
The majority of these Euro pull-downs come with a flood coolant system.
The European pull-down saws maintain an incredible tolerance; 0.001" per linear
inch of cut from side to side and top to bottom. In other words they hold as
tight or tighter tolerances than most of their larger brethren. As a result,
many of these saws are capable of being used in demanding production environments.
In terms of usage they are quite varied. However, some typical environments
include fabrication where the pieces are varied and require different angles.
These pull-down saws lend themselves quite well to the fabrication shops as they
can be easily set up and the operator can regulate the speed of the cut by pulling
down on the head. The head is balanced such that upon completion of the cut it
will return.
Pull-down bandsaws have been the staple in Europe for decades and they are
just now starting to be used in North America. With the pull-down feature it
makes for easy set up of various sized materials. One need not adjust the head
height for every material. Rather, the operator self-regulates the height by
simply lifting the head to the required level.
Some may think that this type of machine would be fine for a job that requires
a number of various sized components but that if one needs to perform straight
production of one material it could become fatiguing. This is quickly remedied
by the optional gravity feed. With the gravity feed option the machines are able
to cut material without the operator having to pull the head down. What this
demonstrates, once again, is the flexibility of these types of machines. In fact,
these machines are readily available even in single-phase configuration. This
means that they are able to operate even in remote areas or even in the handyman’s
garage. The current models being sold by HydMech Group Limited offer a full
range of the pull-down saws with these capabilities and more.
These pull-down saws are becoming more prevalent within North America. As
more of these unique bandsaws are distributed throughout North America, the
benefits of this type of machine will become more evident.
|
