HL 850 Chip Extraction with 27 mm Hose

[otropo]

The HL 850 planer is a great tool, but I immediately discovered that it's the only Festool not designed for use with the 27 mm hose. The hose does fit, but not as well as the 36 mm. While it's held securely in the suction adapter, it doesn't create a tight seal. Unfortunately, most dealers make no mention of this incompatibility. In fact, many offer a combo package including the planer, dust extractor, and 27 mm hose. There's no question that the 36 mm hose is superior, but a minor modification yields more than adequate performance with the 27 mm hose. The 36 mm hose may be necessary for trimming doors, but I've found that the 27 mm hose works fine for most tasks.

The fundamental flaw is the large gap between the hose and the suction adapter. The forceful exhaust blows smaller bits of dust through this gap and larger chips become lodged only to fall on the floor when the hose is removed. Sealing this gap should fix the issue.

I machined an aluminum sleeve to create an air-tight seal between the hose and suction adapter.

The sleeve's o-ring creates a semi-permanent seal with the suction adapter, and its internal retention ring secures the hose.

The final assembly facilitates maximum airflow and efficient chip extraction. I have not seen a speck of wood since installing this sleeve.

It's a great looking looking mod in my opinion.  [big grin]

 

[justinmcf]

great job.

looks very professional!

justin.

 

[tbellemare]

That does look quote professional.

I can't see for sure, but it looks like o-ring friction is what holds you adapter to the tool?

If so, I'd keep a close eye on it. I was using mine as a jointer once (in the mount) and the hose fell off. What a mess!

Naturally, I was working in a tight space with lots of stuff nearby so that clean up required moving a few dozen things to clean in between, behind, etc.

The HL 850 can spit a lot of stuff in a very short time period. You might want to consider a tandem o-ring groove?

Tom

 

[ajones]

Don't shoot me down if I'm wrong [unsure]  but does the negative pressure created by the vacuum help to hold it on?

 

[otropo]

Tom / Festoolfootstool:

The HL 850 can certainly make a mess! The o-ring secures the sleeve to the suction adapter. It's VERY secure. In fact, it would be difficult to remove without breaking the suction adapter (I may as well have glued it). If I ever pick-up a 36 mm hose, I'll have to buy a second adapter. The sleeve's internal retention ring (in the second photo... it's kinda hard to see) mates with the groove in the end of the hose. This is also a very firm fit, but it's easily removable.

 

[woodguy7]

Looks nice & professional but if you were using the planer a lot then i would seriously consider getting the 36mm hose.  I only used to use the 27mm  until it blocked in the middle & what a job i had getting it clear  [crying]  Decided then to get the 36mm so i bought the cleaning set that includes the hose, more economical.

Woodguy.

 

[Michael_MA]

Looks nice & professional but if you were using the planer a lot then i would seriously consider getting the 36mm hose.  I only used to use the 27mm  until it blocked in the middle & what a job i had getting it clear  [crying]  Decided then to get the 36mm so i bought the cleaning set that includes the hose, more economical.

Woodguy.

i second that..  very professional adapter.. looks like you're a pro on the lathe  
Once i got the HL850 i ran it for a while with the 27mm hose.. used it much on chip board and ply and went beyond 1,5mm .. i really got troubles.. So i got myself a 36mm hose, which solved the problem completly.. it did also payoff for using it with my OF2200..

kind regards, Mike

 

[woodguy7]

Mike

Also works better with the Kapex also.

Woodguy.

 

[Michael_MA]

Mike

Also works better with the Kapex also.

Woodguy.

Yeah, thats right, but how you came across that small rubber flap in the back if the Kapex.. i often remove it, knowing the dust extraction will degrade.. is there a smart solution to this prob ?
Just got myself an Ebay bargain, which is the SRM 45E Planex Vac.. this one sucks like Tornado in a box, but haven't tried it on the Kapex yet.

kind regards, Mike

 

[-woodsman-]

I find that the best part about using the 36 mm hoses on tools that have the 27 mm mount is that you have to reduce the hose size right before it enters the tool.  This increases the speed of the air flow.  I wonder if in this situation the increased air flow could stay ahead of the largest amount of chips you could possibly make and keep the 27 mm hose free of clogs before the chips reach the 37 mm. I'd like to try it with the profiled cutters and get some big chips going.  For the sake of science of course.

 

[AlexThePalex]

Festool should bring out a D36 nozzle that fits on the 27mm hose. And vice versa.

 

[jmbfestool]

I cant see how at 27mm hose works on the HL 850 because the 27mm hose struggles with my EHL65  when I am planning Plywood face.

I havent ever used my HL850 on the 27mm cus of the reason it doesnt fit. I do need to get a 36mm hose though.

Ill do a video showing what happens to mine

JMB

 

[jmbfestool]

Just a quick picture to explain what mine always does.

The plywood fibre like shavings sit on the edge of the hose and then slowly build up and create a pyramid which then blocks the hose.
[attachimg=#]

 

[otropo]

Just a quick picture to explain what mine always does.

The plywood fibre like shavings sit on the edge of the hose and then slowly build up and create a pyramid which then blocks the hose.
[attachimg=#]

This is exactly what I observed with the HL850. However, it seemed that the chips would first become trapped between the hose and suction adapter. Then, chips would accumulate until the hose was blocked. When I removed a blocked hose, I never found any chips that were large enough to create a block on their own. You're exactly right; it builds a little pyramid.

I sealed the gap between the hose and suction adapter with the hope that those first chips would lose their foothold. Additionally, you then get the full suction power of the vacum combined with the substantial exhaust force of the HL850. I imagine this helps to blast through blocks as they form.

It's worked well for me... I haven't had a blocked hose since. However, I do light planing mostly; a lot of post glue-up clean-up of 1.5" wide material. I would still expect to encounter issues with deep cuts in wide material.

 

[-woodsman-]

Just a quick picture to explain what mine always does.

The plywood fibre like shavings sit on the edge of the hose and then slowly build up and create a pyramid which then blocks the hose.
[attachimg=#]

jmbfestool are you using a 27 mm hose alone or a 36 with the 27 mm reducer?  Just wondering.

 

[jmbfestool]

Just a quick picture to explain what mine always does.

The plywood fibre like shavings sit on the edge of the hose and then slowly build up and create a pyramid which then blocks the hose.
[attachimg=#]

jmbfestool are you using a 27 mm hose alone or a 36 with the 27 mm reducer?  Just wondering.

I just have what comes with the CT22 when I bought it.  so a dia. 27 x 3.5 m-AS.

If any one wants to see ill do a quick video. Just dont want to do a video if no one is interested lol

jmb

 

[woodguy7]

Always interested in pics & vids 

 

[Corwin]

... Just dont want to do a video if no one is interested lol

Hmmm, you must be new around here.    [unsure]

 

[jmbfestool]

... Just dont want to do a video if no one is interested lol

Hmmm, you must be new around here.    [unsure]

I got over 500 posts  [tongue]

Lol I take it its a yes then!!!

JMB

 

[jmbfestool]

Here you go I made a Video JUST!

I know the Video is rubbish but you try and hold a camera in one hand and making sure your aiming it correctly and then doing stuff!  Remember I am a bloke multitasking!!!

P1010408.MOV

JMB