Thread: Dc purchase

Here it is. Nice piece of work, too.
https://www.woodworkforums.com/showth...eneric+bobl+hp

If you use modified 2HP you can install and take advantage of 6" ducting and also modify your machine outlets accordingly - then when you upgrade to a bigger unit nothing is lost.
If you do a nice job on it you should also be able to sell the modified 2HP DC for a bit more than you otherwise would.

PS It's really good to have that ability to open up the two ends of your shed like that.

Thank you for your replies. I am reading through the post now making notes of exactly what i need to do.

Im thinking this will get me by for the time being

http://www.garypye.com/Dust-Collecte...lter-p751.html

delbs,

Given that you will only use this machine for a year or so, it it worth having a look around for a second hand machine?

Cheerio!

John

Originally Posted by John Samuel

delbs,

Given that you will only use this machine for a year or so, it it worth having a look around for a second hand machine?

Cheerio!

John

Great idea, i did look around a while back but none were available. I will take a look again. Anyone on here have one they want to pass on?

Found one on Gumtree but i dont have time to drive up to Sussex inlet to get it. At least courier would be cheaper if i were to buy a cheap DC from hares and forbes or GPW

Originally Posted by delbs

Great idea, i did look around a while back but none were available. I will take a look again. Anyone on here have one they want to pass on?

Found one on Gumtree but i dont have time to drive up to Sussex inlet to get it. At least courier would be cheaper if i were to buy a cheap DC from hares and forbes or GPW

Here is one on gumtree that is 75 HP and is only a touch more than the cost of your "table saw": http://www.gumtree.com.au/s-ad/gwand...er-/1038357399

Ahh yes provided i wont loose the actual stock i square up inti the black hole timber eating horses in that machine it seems like a good fit lol

Bobl,

Do you think this is suitable for modification? or should i go for the generic Carbatech 2HP?

http://www.machineryhouse.com.au/W329

Also was thinking of this

http://www.machineryhouse.com.au/W328

then modifying it to fit 150mm piping

Originally Posted by delbs

Bobl,
Do you think this is suitable for modification? or should i go for the generic Carbatech 2HP? http://www.machineryhouse.com.au/W329
Also was thinking of this http://www.machineryhouse.com.au/W328 then modifying it to fit 150mm piping

The 3HP H&F modified to a 6" intake will move more air than a generic 2HP modified at both intake and outtake.

The 3HP H&F would move even more air if the impeller to filter housing were not so pokey and contorted.
The better designs have the impeller attache direct to the back housing.
I was going to buy a used DC-7D and try to modify the outlet to see if I could improve the flow along the lines of what I did for the generic 2HP outtake but I could not see a way of doing it easily so I gave up on that idea.

Originally Posted by BobL

The 3HP H&F modified to a 6" intake will move more air than a generic 2HP modified at both intake and outtake.

The 3HP H&F would move even more air if the impeller to filter housing were not so pokey and contorted.
The better designs have the impeller attache direct to the back housing.
I was going to buy a used DC-7D and try to modify the outlet to see if I could improve the flow along the lines of what I did for the generic 2HP outtake but I could not see a way of doing it easily so I gave up on that idea.

Is the housing that you refer to as pokey and contorted welded in? Im assuming take to it with an anglegrinder?

So following another thread you linked me to, if i make 6" ducts for both intake and outake and use 6" to all of my machines i will get much better airflow than the stock 3HP machine?

i may just install a 2nd or 3rd 4" in my jet bandsaw, modifying the rest like the Hammer combo machine etc will be easier

Originally Posted by delbs

Is the housing that you refer to as pokey and contorted welded in? Im assuming take to it with an anglegrinder?

The Twisty "Y" connecting the impeller to the filter housings are bolted together so angle grinder may not be necessary.

Here is how I would modify the DC7
Disassemble the DC and discard the Twisty Y
Lift the motor/impeller up onto a stand as per the generic 2HP DC thread. The 3HP motor is a fair bit heavier so it will need carefully placed support.
Cut the top and bottom rims off the bag housing
Make a well sealed box (18mm MDF would be heaps) that is large enough to cut out two holes on the top and bottom to inset the rims of the bag housings.
Glued and screw rims in place - leave enough rim protruding to enable filters/bags to be reattached.
Bolt and seal DC to the side of the box as per top diagram in photo.
Box could also employ curved inside corners to reduce turbulence.
This is effectively what the Carbatech and Woodfast 3HP DC have


DC7mod.jpg
Alternatively, leave bag housings intact and just bolt them together.
Before doing this make a curved flange/adapter as per the 2HP generic DC and attach opposite to the existing flange on one of the bag housings
Attach impeller to new flange.

The first one is the easiest as no curved flange need be constructed but it will be heavier and need more support.

The box and/flanges could be made all out of MDF - just like Jonno did in his mod.
These would be fun mods and not that hard to do.

So following another thread you linked me to, if i make 6" ducts for both intake and outake and use 6" to all of my machines i will get much better airflow than the stock 3HP machine?

The biggest to smallest improvements will be in this order
converting the impeller intake from 4" to 6" and using 6" ducting.
Improving the outlets on all machines
The use of pleated filters
Modifying the impeller to Bag housing outlet

i may just install a 2nd or 3rd 4" in my jet bandsaw, modifying the rest like the Hammer combo machine etc will be easier

The standard intakes with the cross bar grids on bandsaws are not even 100 mm in diameter and only draw ~300 cfm
Cutting out the cross bar will improve things to around 350 cfm
Remember it takes 3 x 100 mm diameter ducts to equal the flow in one 6" duct.

So bobl the only modification you would make to the woodfsst 3hp machine would be use 6" ports everywhere?

Thanks for your advice so far. Its appreciated

Originally Posted by delbs

So bobl the only modification you would make to the woodfsst 3hp machine would be use 6" ports everywhere?

Thanks for your advice so far. Its appreciated

Be careful with the Woodfast unit - I heard (pun intended) that it is VERY noisy.
It maybe OK if it is a noise proof enclosure outside the shed.

Yes I would use 6" everything.

Hi delbs,

When looking at 3HP units make sure you check that the impeller size is 13”.

I’ve see a number advertised recently with 12” impellers. Apart from having a bigger bag area, these would perform no better than a standard 2HP unit.