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Dust collectors???

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Forum topic by scribble posted 07-31-2014 03:42 PM 755 views 0 times favorited 10 replies Add to Favorites Watch
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scribble

69 posts in 947 days


07-31-2014 03:42 PM

Topic tags/keywords: question

I know everyone likes the HF 2HP dust collector especially after being modded. I am leaning towards this unit but have found a used Grizzly unit that is used for approximately the same price but I don’t know the HP ratings. Looking at the picture of it vs grizzly catalog it looks like it might be a 1.5 hp unit has the motor housing is hooked to the bags via hose and not a metal ducting.
I am currently using my Ridgid shopvac with a thein 5 gallon bucket separator that is working great but am getting tired of dragging the unit around from tool to tool. I would like to just running piping and have a hose to a few hoses.

Any suggestions as were to proceed.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”


10 replies so far

View MrRon's profile

MrRon

2979 posts in 1990 days


#1 posted 07-31-2014 04:02 PM

Whether Grizzly or HF, they are both made in China. The two units are most likely the same. The HF 2 horse motor is really only 1-1/2 HP. Companies use arbitrary numbers to make their product sound more powerful. The only way to know what the HP is by the amps rating on the motor plate. A 2 HP motor running at 3450 RPM on 110 V will consume 11.8 amps. A similar 1-1/2 HP motor will consume 10.6 amps. Amps rating of a motor will vary depending on the speed , the service rating and power factor.

View English's profile

English

250 posts in 224 days


#2 posted 07-31-2014 04:06 PM

If you plan to install ducts, design you layout first. Then use Bill Pentz duct lose spreadsheet, www.billpentz.com/woodworking/cyclone/staticcalc.xls , to determine the duct losses to your worst case machine. Then find a DC that can provide the static pressure and flow that you will need. The HF unit is a good chip collector but with 10” impeller the static pressure it provides will leave you short for a whole shop ducted system.

-- John, Suffolk Virgina

View RogerInColorado's profile

RogerInColorado

306 posts in 701 days


#3 posted 07-31-2014 05:30 PM

I have the HF collector. It isn’t really 2HP, it does round up to 1.5HP. However, I do have a ducted workspace with a 20+ foot duct run and gates for my TS, BS, Planer, Oscillating Sander. drum sander, router table and Drill Press. I have a Thein separator in a 30 gallon trash can. I changed the upper bag to a 5 micron filter bag from Highland Woodworking. Every so often I see posts on forums that my setup won’t work, but it does. I’ve not had to empty my lower bag even once since I installed the separator (Thank you, Phil Thein!) and I’ve emptied the trash can dozens of times. I live at 7000 feed above sea level where the air is really thin and hard to spin. It doesn’t empty the dust hood for my TS if I forget to turn on the DC and let it accumulate, but it’s easy to sweep it out and into the DC port. If I had the dollars to buy a 3HP DC I’d buy more lumber instead. If you can get the Griz for about the same price as the HF, I’d say go for it. It seems to me that the impeller is a tiny bit larger diameter than the HF unit, and that is beneficial.

View scribble's profile

scribble

69 posts in 947 days


#4 posted 08-08-2014 01:15 PM

Ok, I think I am more confused then when I started. I am only looking to run the DC with my TS,Jointer, and Planer. I will also use with my Plunge and shop cleanup eventually with a sanding bench. I will only be using one tool at a time and most likely setup runs with blast gates

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

View bigblockyeti's profile

bigblockyeti

1792 posts in 467 days


#5 posted 08-08-2014 01:21 PM

Look at the difference in impeller diameter (if there is one) between the HF unit and the Grizzly unit. Bigger is better. As mentioned many times, in several threads, the numbers aren’t something that can be relied on as most of them are a function of creative rounding.

View English's profile

English

250 posts in 224 days


#6 posted 08-08-2014 02:29 PM

The goal with dust collection is to collect the chips and the fine dust from you saws and bits. The HF 2 hp unit is a good chip collector right out of the box as designed. It is a roll around with a 10” impeller and with a short hose to connect to your tools. It can deliver a Static pressure of 7” at no flow. The CFM threw a 4” flex hose connected directly to the unit will be in the 450- 500 cfm range.

If you add a separator like a thien top hat. The static will be reduced by 4.5”. If still used has a roll around with a section of 4” hose. The unit may be able to produce 200 cfm. 200 CFM will still pick up chips close to the tool port connection but the velocity of the air flow has now reduced so that there is no chance to pick up the fine dust released by your saw blades and bits.

If you add duct work with blast gates, wyes, 90 elbow, and straight duct with flex to connect the tool ports. The system will start having issues just getting the chips back to the collector due to low velocity. And at some point will clog up the duct work.

A unit with a larger impeller will provide more static pressure. The Grizzly 1.5 hp unit has a 12 3/4” impeller can provide 9” of static pressure. With the higher static there would be 4.5 left after the top hat separator. With 4.5” of static you could get as much as 300 cfm through the hose connected to the unit. Still even with this unit adding duct work will reduce the static and if enough duct is added the system will clog.

For these reasons systems designed to connect to fixed duct work should be able to produce at least 12” of static pressure and have a cfm rating at 7” to 8” of static loss of 1000 cfm for good fine dust collection.

-- John, Suffolk Virgina

View timbertailor's profile

timbertailor

1091 posts in 171 days


#7 posted 08-08-2014 04:01 PM

For the price of the Grizzly, you could get two HF’s. Right now they are on sale for $209 and then take another 20% off until August 17th, 2014 makes it $167 plus tax.

Coupon Code 72463704

Add a 0.5 35A micron bag kit from Wynn Environmental and few other mods to recover some of the cfm lost through ducting.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

View scribble's profile

scribble

69 posts in 947 days


#8 posted 08-08-2014 04:12 PM

So you are saying go with the HF one due to the price??


For the price of the Grizzly, you could get two HF s. Right now they are on sale for $209 and then take another 20% off until August 17th, 2014 makes it $167 plus tax.

Coupon Code 72463704

Add a 0.5 35A micron bag kit from Wynn Environmental and few other mods to recover some of the cfm lost through ducting.

- timbertailor


-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

View English's profile

English

250 posts in 224 days


#9 posted 08-08-2014 05:00 PM

.


For the price of the Grizzly, you could get two HF s. Right now they are on sale for $209 and then take another 20% off until August 17th, 2014 makes it $167 plus tax.

Coupon Code 72463704

Add a 0.5 35A micron bag kit from Wynn Environmental and few other mods to recover some of the cfm lost through ducting.

- timbertailor


What kind of mods can you make to recover cfm lost through ducting?

-- John, Suffolk Virgina

View English's profile

English

250 posts in 224 days


#10 posted 08-09-2014 10:18 PM

To answer your question about the HF or Grizzly. The 1.5 hp grizzly is a much better DC than the HF. HF is a good unit for what it is designed to do. But the Grizzly with a 12 3/4” impeller will serve you better. If you run duct work off either unit with a separator of any type the resulting losses will reduce the airflow to a point that you will not pick up the fine dust. It will still keep your shop clean. But you will need to wear respirator, not a dust mask but a respirator while making dust and for several hours after to keep the fine dust out of your lungs.

If you want to learn more about the hazards of wood dust, look over the info at this site.

http://billpentz.com/woodworking/cyclone/

If I can answer any other questions for you, you can PM me or start another post.

-- John, Suffolk Virgina

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