Bandsaw types ?

graham-xrf

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When I go internet searching for bandsaws, I do, of course, mean something that will cut metal. The style on a stand, and with a little table, would seem to be the most useful, especially if one already has a saw capable of cutting longer lengths of steel, like square box section (my Evolution brand brand circular saw does that). The table kind seems always listed for "woodwork", and if we are searching after metal cutting, we always get shown either the small portables, a reciprocating thing on a low stand, or the style well known as the HF 4 x 6.

My mind tells me that the "little table type" is surely OK for metal as well as wood, provided one uses the appropriate blade, but here we are floundering in ignorance, so I suppose the first question is, does it matter? Maybe if there is something special about making them cut metal, a little "modification project" might be OK. I am thinking that for metal..

1. You need a different blade.
2. You need some speed control to go slower.

Here are a couple of pictures of the type I mean.
The Charnwood B250 is a 10" costing £453 ($597), has a cast iron table, and is described as "Woodworking Bandsaw.
The red Lumberjack B5340 is a 14" at £699 (that's $922.68), also has a cast iron table, also described as "Woodworking".
Is there something about this style that makes it a no-no for metal?

Bandsaw-1.jpg _ _ _ Bandsaw-2.jpg


Definitely for metal!
We all know of the HF 4 x 6, which a lot of folk buy, and then often modify (upgrade?). About $350 to folk in USA. We don't have HF in the UK, but clearly the identical thing seems to costs £350 ($462) here. I don't know why. The white Draper to the right is £500 ($660), showing off a little table .
Maybe that is something the HF 4 x 6 can also do, I don't know.

HF 4 x 6 bandsaw.jpg _ _ _ Bandsaw-3.jpg


The portables?
You know the type, like the Makita in the picture, though they do come bigger in that style. That one is £237 ($312.84).

Bandsaw-4.jpg

Quinn Dunki (Blondihacks) also expresses the desire for a table feature on a metal cutting saw. One of her projects was to get up a modification to a portable to give it just that, in an arrangement that can be clamped onto a bench vise via a piece of angle iron..
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The only one I found that claims to do metal, although it is still apparently, a woodworking type. It claims that, given a M42 blade, it can do mild steel 2mm to 10mm. Not thinner, not harder, and no stainless. Without even a stand, it's £1700 ($2244) ! The price range for a lot of stuff spans way too much for me to take a guess at real value. I am thinking that even with the added cost of a speed slow-down mod, VFD, or something, I don't expect to go well over $2K !

Bandsaw-Axminster AT1854BV.jpg

I put this here for folk to pitch in. If you have a table type, or have contrived one, or would prefer one, do tell.
 
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The trick is getting a saw to run slow enough (60-200 fpm) to cut metal. A simple variable speed saw will not go that slow or, if it does, will have no power and will stall easily. It's even hard to accomplish sufficient speed reduction with belts, pulleys and countershafts. People have converted woodcutting bandsaws, but it usually requires a reducing gearbox. Even the lowly HF 4x6 has one.

I had a spare 4x6, so this is what I did.

20210729_230650.jpg
 
I have and old Rockwell clone 14" vertical bandsaw that has pulleys for 4 speeds. With the appropriate blades I can wood or metal, although I do often cut aluminum with the blade and speeds for wood.
 
The catch is getting a saw to run slow enough (60-200 fpm) to cut metal. A simple variable speed saw will not go that slow or, if it does, will have no power and will stall easily. It's even hard to accomplish sufficient speed reduction with belts, pulleys and countershafts. People have converted woodcutting bandsaws, but it usually requires a reducing gearbox. Even the lowly HF 4x6 has one.

I had a spare 4x6, so this is what I did.

View attachment 401586£1700 ($2244) !
To be clear, is it that you took apart the 4x6 to donate it's gearbox to a regular woodworking bandsaw?
If it's all about delivering torque at very low speed, then maybe I should go for the white one with the little table add-on.
 
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I have and old Rockwell clone 14" vertical bandsaw that has pulleys for 4 speeds. With the appropriate blades I can wood or metal, although I do often cut aluminum with the blade and speeds for wood.
Thanks Bill.
If possible, please mention the speeds. Also, if you know, what is the brand name of the clone?
 
To be clear, is it that you took apart the 4x6 to donate it's gearbox to a regular woodworking bandsaw?
If it's all about dlivering torque at very low speed, then maybe I should go for the white one with the little table add-on.
No, I adapted the entire head of the saw. By removing the twist from the blade and a little frame modification I got 6" of throat.
The description of the conversion starts here:
 
I used a worm drive gearbox to add a second drive pulley to mine and get dual wood/metal abilities.
As above, slooow is the key bit for metal. Wood wants "screaming"

Sent from my SM-G715A using Tapatalk
 
I used a worm drive gearbox to add a second drive pulley to mine and get dual wood/metal abilities.
As above, slooow is the key bit for metal. Wood wants "screaming"

Sent from my SM-G715A using Tapatalk
Yes - I saw one that said 800m/min. Doing the sums makes that 2624ft/min
I am not sure this is a good number!

@MrWhoopee said 60-200ft/min. 60ft/min is about 2/3mph. Basically a slow stroll!
Any picture of the worm drive mod maybe?
 
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A few weeks ago, I converted an older Rockwell 10" vertical wood bandsaw for use on metal. In this case I replaced the original 4" drive pulley on the lower wheel to a 12" pulley and added a 15:1 right angle reducer and 1725 rpm motor assembly. The pulley on the gear box is a variable width so I can change the speeds of the blade from a maximum of 104 fpm to a minimum of 67 fpm.

While it can be done and is relatively easy it can be expensive if you don't already have the parts. Here's a link to the thread. https://www.hobby-machinist.com/threads/another-dinosaur-comes-back-to-life.98513/#post-931623

It works well for what it is, but it's still a low end saw. If I had the room, I'd be looking for either a DoAll or Grob. They are built considerably better and come from the factory with a selection of speeds for both wood and metal. The downsides are that they are exponentially larger and considerably more expensive.
 
A few weeks ago, I converted an older Rockwell 10" vertical wood bandsaw for use on metal. In this case I replaced the original 4" drive pulley on the lower wheel to a 12" pulley and added a 15:1 right angle reducer and 1725 rpm motor assembly. The pulley on the gear box is a variable width so I can change the speeds of the blade from a maximum of 104 fpm to a minimum of 67 fpm.

While it can be done and is relatively easy it can be expensive if you don't already have the parts. Here's a link to the thread. https://www.hobby-machinist.com/threads/another-dinosaur-comes-back-to-life.98513/#post-931623

It works well for what it is, but it's still a low end saw. If I had the room, I'd be looking for either a DoAll or Grob. They are built considerably better and come from the factory with a selection of speeds for both wood and metal. The downsides are that they are exponentially larger and considerably more expensive.
Thanks for the link, and indeed to folk who give me the clues. I think one reasonable plan is to try for one of the better engineered woodworking bandsaws. Changing the first pulley size to be larger only goes some of the way to the speed reduction needed. Then, change out the motor for a 3-phase, but with 4 poles instead of two. This halves the speed again. Then drive it with a vector VFD, which can slow it right down while still delivering good torque. If one wants to cut wood, then just dial up the VFD.

.. at least, that's the fond notion in my head. None of the portables, nor the HF 4x6 style seem very appealing. For those who only ever cut metal, the HF 4 x 6 style has potential to be a low cost starting point for some really great kit. There are a ton of mods and upgrades, many on YT videos.
I am only finding keeping the dual metalwork/woodwork capability concept attractive because I have a ton of woodworky stuff yet to come - starting with benches, French cleat storage, and much more.

@MrWhoopee 's great link lands on page #5. Have a look at page #1 for lots more. :)
 
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