Black & Decker BD-339 Bandsaw help

[jweaver]

I have just taken a chance on a B&D BD-339 Bandsaw off eBay and it arrived today and its a bit of a mess unfortunately.

I have no doubt that its salvageable but in its current condition I fear I paid over the odds.. But it was a gamble so I just need to move on.

The biggest problem is that the motor was hanging off and I wonder if this happened in transit as the seller didn't pack it particularly well.. The bolt was inside the saw and the thread on the motor has been torn out (Although if I am honest, I suspect its was like this before as there is no evidence of any thread material on the bolt).

I have removed the motor, and I think the best thing I can do is drill/tap out the hole to take an M8 bolt (Or perhaps an M7 (which I would have to source)..

But now I have it out, I want to service the speed control mechanism and don't have a clue how it works.

On the end of the motor shaft is a V-pulley and underneath this a large spring.. How exactly does this work? Does the pulley need to move up/down the shaft?

When its back together, I noticed when you turn the Rod, which is connected to the motor mount, it makes the motor move and I assume this makes the mechanism on the end of the motor shaft do its thing.. But I cant' work out how it works.

Can I also ask that the speed indicator that you see next to the power switch doesn't actually do anything? Its just there to show the position of the motor? Or as that in some way part of the mechanism.

Thanks in advance for any advice you can give.. I am still hopeful that I can get the saw working to a reasonable standard.

Jon

 

[jweaver]

I think I have worked it out.. The V-Pulley is in 2 parts.. And the lower 1/2 (closest to the motor) moves down the shaft.. Allowing the belt to drop lower into the 'V' adjusting the gear ratio.

So I guess i just need to ensure that lower 1/2 of the pulley moves smoothly.

The bit I don't understand is that to adjust the speed, you have to turn the handle at the back.. Moving the motor on its mount, rotating it around the top mounting bolt (which is stripped on mine).. How exactly does that work? How does the bolt stay tight?

Is there a need for some kind of washer between the motor and saw to allow the motor to move?

 

[Claymore]

I think you might loosen the motor mounting bolt to slacken the drive belt so you can manually put the belt on either of the pulleys? bit like on my bench drill....... to change the speed i have to slacken a bolt then push the motor inwards to slacken the belt and then after i have put the belt on the pulleys i pull the motor back and tighten the bolt so maybe you do the same with your saw?.
Personally i would ask the seller for a refund if it arrived damaged and wasn't listed as it.

 

[blackrodd]

I just googled bd 339 bandsaw and 7th down is an exploded drawing hosted by Miles tool and machinery.
You may find this useful to help answer some of you're question.
Even look as if some parts are still available,
there are times I find mine quite useful.
As I recall, the quadrant like speed indicator shows to the right hand side for bigger blades, fastest, and the left hand or slower for smaller blades, as I still have the sticker showing the blade size, so hopefully, that's correct. I'll try and get a look tomorrow. HTH Regards Rodders

 

[jweaver]

I just googled bd 339 bandsaw and 7th down is an exploded drawing hosted by Miles tool and machinery.
You may find this useful to help answer some of you're question.
Even look as if some parts are still available,
there are times I find mine quite useful.
As I recall, the quadrant like speed indicator shows to the right hand side for bigger blades, fastest, and the left hand or slower for smaller blades, as I still have the sticker showing the blade size, so hopefully, that's correct. I'll try and get a look tomorrow. HTH Regards Rodders

Mine still has the stickers so i can see what its showing.. I wa mre interested whether the "guage" was simply an indicator? Or whether to had any moving prts that you have to use to change the speed,

Now that i have looked closer, i can see how it works, so hopefully it will all be OK when i put it back.

I have drilled/tapped an 8mm hole in the motor and will now use an 8mm golt to secure it so that bits sorted..

But i still have a few questions.

1. Is there a rubber "tyre" on the top!back wheels? The drive wheel has one, but tye other 2 have a black "crust". Its either the remains of a tyre thats perished.. Or ingrained dirt which has built up into a layer.. My assumption is that ts NOT rubber and not ment to be there.

2. What goes between the chassis and top bolt on the motor? Is it a simple washer.. The parts diagram isnt clear and in my case, its missing.

3. The bearings behind the blade are pressed into a shaft... Is hs something you can get from a bering supplier, or is this only a B&D part?

4. Can you get a non-B&D v-belt? Mine is OK but its showing its age and would like to replace it.


Answers to ANY f these questions would be appreciated

Jon

 

[blackrodd]

Is the bolt you refer to number 59 or 78 for the motor mount?
I guess one washer is just that but the inner one may well be a stepped spacer washer to allow the motor to swing.
when the bolt is done up tight. tight
The belt is number 49 @ £13.70 and if the rear blade support bearing is not seized, and can't be freed off I'd just get number 17 replaced, if that's the one @ £9.26
Unless you have a trade account somewhere, it's not likely you will get the belt, washers, or support bearing cheaper,
You could always take the bearing off and measure it, for replacement
To be honest, we are lucky in that there are still so many parts available today.
There is a bottom tyre as I recall, black, as you say but not on the other two, on mine.
The black deposit on the other two wheels you describe, are either residue from its former cutting life, or you may wish to look at the driving wheel tyre and check for perishing.
HTH Regards Rodders

 

[jweaver]

The bolt which is threaded is Part 59.. This is a 6mm bolt, so I have now "upgraded" it to 8mm.

The part I am missing is 7.. I think its just a washer.. But I can't be sure.

On the subject of the other parts.. I don't actually need them.. I was more interested in the availability of "consumables" (Bearings, Belts, etc)...

The Belt is OK and I think has some years left in it.. And the bearings spin freely (but they will need a bit of oil and a clean).. My interest was where I would get them IF they official spares weren't available.. My assumption is that bearings and belts are "generic" things.. But the belt is tiny.. And the bearing are fixed onto a shaft.. So I am not sure whether they are standard items, or can only be sourced through the official 'spares' channels...

I just hate paying £16 for a belt.. When its something that can probably be source through a specialist V-Belt supplier.

But hang on.. I just noticed that the bearing is in 2 parts (16 & 17), so it DOES come of the shaft.. A stock bearing is going to be pennies, so I am not paying almost £10 for one of theirs...

I will have to remove the bearing and see how to get it off the shaft and check wiether its worth replacing.. All I need to think about now is a belt!


On the subject of the rubber tyre.. My front wheel has it and its in perfect condition.. I am almost certain that the black stuff on the other wheels is just a build up of wood dust, oil and grease and I set about it with some degreaser last night and got it off...

So I am pretty sure its all good....

Edit: I think I have found the belt.. Its a "Y Section" (6x4mm).. And it looks like this is what I would need (once I confirm the length)

http://www.industrialproducts.be/en/fil ... -a-b-c.pdf

 

[woodpig]

Belts and bearings are normally generic items as you suggested earlier. They can be a bit tricky to source sometimes though. For belts I've used Halfords or other Motor Factors. There are lots of bearing suppliers around and you often have a choice of budget or premium bearings. for any other issues take some pics and let us have a look. Lots of knowledgeable folks on here.

 

[jweaver]

Belts and bearings are normally generic items as you suggested earlier. They can be a bit tricky to source sometimes though. For belts I've used Halfords or other Motor Factors. There are lots of bearing suppliers around and you often have a choice of budget or premium bearings. for any other issues take some pics and let us have a look. Lots of knowledgeable folks on here.

Cheers. The belt is tiny (perhaps 6x4mm).. Not something found in a car so autofactors won't be able to help.. I think its a "Y-Section" and if so, should be easy to source from a belt/bearing specialist.

And I think the bearings are simply a standard too.. Just pressed onto a shaft.. Going to have a look to see what they are.. And then work out how to get them off/on the shaft.

 

[jweaver]

I do have one question.. As i understnad it, when you change the speed, the motor pivots on its top mounting bolt..

Assuming you change the speed lots, surely this would loosen the top bolt?

I guess you could keep nipping it up? But is this really how it works? I wonder if you could use threadlock to lock the bolt, and leave it ooose enough for the motor to swivel?

 

[blackrodd]

Rarely use my speed controller, it's about 2/3rds towards fast, which seems to be ok.
Not sure about the pivot bolt, according to the instructions, further down from the parts list, that's what you are apparently supposed to do so maybe I should leave my speed control alone!
Regards araodders

 

[n0legs]

The belt is tiny (perhaps 6x4mm).. Not something found in a car so autofactors won't be able to help.. I think its a "Y-Section" and if so, should be easy to source from a belt/bearing specialist.

Assuming you're in Newport South Wales.
Try Antifriction Components on Llantarnam Ind Est in Cwmbran, just off Cwmbran Drive.
Some very helpful and knowledgeable staff there. I've used them professionally and privately for years, always had a good result.

 

[jweaver]

Rarely use my speed controller, it's about 2/3rds towards fast, which seems to be ok.
Not sure about the pivot bolt, according to the instructions, further down from the parts list, that's what you are apparently supposed to do so maybe I should leave my speed control alone!
Regards araodders

Instructions? You dont by chance have a soft copy do you?

Are you saying that the instructions say that you have to tighten/check the top bolt after changing the speed?

 

[jweaver]

The belt is tiny (perhaps 6x4mm).. Not something found in a car so autofactors won't be able to help.. I think its a "Y-Section" and if so, should be easy to source from a belt/bearing specialist.

Assuming you're in Newport South Wales.
Try Antifriction Components on Llantarnam Ind Est in Cwmbran, just off Cwmbran Drive.
Some very helpful and knowledgeable staff there. I've used them professionally and privately for years, always had a good result.

I know them. They were very helpful when i was looking for a belt for my pilar drill... I will take the beltin and see what they think of it. Cheers

 

[WibbleWobble]

Is this model similar to a Burgess BK3? As I scrapped one not so long ago as the table was banana shaped and I couldn't get it to keep a blade on as one set of the guide bearings were missing.

If it is the same and you need any parts let me know and I will see what I can dig out.

 

[jweaver]

Is this model similar to a Burgess BK3? As I scrapped one not so long ago as the table was banana shaped and I couldn't get it to keep a blade on as one set of the guide bearings were missing.

If it is the same and you need any parts let me know and I will see what I can dig out.

Thats very kind of you.. The only part that I know is broken right now is the "knob" to change the angle of the bed.. The plastic part is broken and I found the bits in the box so it happened in transit.. But in truth, iits just a nut and I could use a spanner.. AND.. I have a 3D printer, so I could even make a new nob.

Oh yes.. And one foot is missing.. But again, 3D Printer ahhoy!!

Once I put it back together at the weekend I will let you know.. I would gladly pay you for any parts I need...

 

[Higon]

@Jweaver

I had a bit more luck with one of these off ebay from the sound of it. Added some of Ian's blades and its still going well. I'm just making some new roller bearing guides for it to replace the standard things. drop me a PM if you want the plans.

 

[jweaver]

@Jweaver

I had a bit more luck with one of these off ebay from the sound of it. Added some of Ian's blades and its still going well. I'm just making some new roller bearing guides for it to replace the standard things. drop me a PM if you want the plans.

I dont think that i did too bad.. Other than the threaded botl, it seems pretty much complete..i got my Tuffsaw blades today so will rebuld the sa at the weekend and will see how it goes.

I paid over he odds for sure, but i think that once it running it wont be too bad.

Will send you a PM as i am very interested to learn wht you have done with yours.

Jon

 

[woodpig]

@Jweaver

I'm just making some new roller bearing guides for it to replace the standard things. drop me a PM if you want the plans.

Ah, someone else making their own guides! Did you see the one I made for my BS300E?

can-you-guess-t86079.html

 

[jweaver]

I put the saw back together yesterday and its working perfectly.. It might be a bit ugly. And I am not even sure if its designed that well.. But I have to admit that its works well.. And to be fair, the first cuts I did with minimum "setup", cut 1000x better than on the Axmister that I originally bought.. For my application, its going to be perfect.

However, I have a question about the speed control system and wanted to get your thoughts.

When I installed the belt, its running on the outside edge of the pulley. When I start to turn the handled at the back, moving the motor away from the drive wheel, the belt starts to stretch, rather than pull itself into the "groove" onto the pulley.

If I keep turning, eventually the belt moves down into the pulley, but I run out of movement on the motor, before the belt moves far enough to significantly change the gearing and speed up the belt.

So I am pretty sure that the belt has stretched and a replacement will sort this out..

BUT.. When I have the motor wound back, so that belt is tighter and trying to pull itself down into the heard of the pulley, the entire drive system gets a lot tighter, so the point than when you start up the saw, the motor binds before it gets going.

So I am not entirely convinced that changing the belt will do much here.. No doubt it will let me control the tension better (And therefore the speed), but I don't feel that the motor has enough power to handle the increased binding of the belt/pulley/drive wheel.

I wonder if instead, the pulley mechanism (I believe its called a Reeves Drive) needs servicing?

Does anyone have any thoughts.. I am not really bothered if I can't adjust the speed of the saw.. But I do think that its currently running at its slowest speed and would like to fix that?


Jon

Edit: I think I made a mistake.. Looking at the sticker on the side of the saw.. Moving the motor away makes it SLOWER not faster.. So when the belt is on the outside of the pulley (as mine is now) thats its fastest speed).. But as you wind the motor out, stretching the belt, causing it to pull into the heart of the pulley the saw gets slower..

As such, I have lost the ability to slow the saw down, rather than speed it up, and I wonder whether I should even bother worrying about this and should perhaps live with it running at a single speed and save a few quid on a new belt.