Author Topic: Dust control for TCG and surface grinder  (Read 583 times)

Offline PekkaNF

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Dust control for TCG and surface grinder
« on: September 04, 2017, 02:38:13 AM »
I finally have Cincinnati No. 2 Tool & Cutter Grinder somewhat operational and done some first grinding.

Next step is dust removal. I tried normal wet and dry vacuum cleaner and manually holding the nozzle, seemed to work somewhat but if will not be real and final solution for several reasons. I have 2,2 kW fan for high flow/low pressure system it has 160 mm dia inlet, and nearly 400 mm impeller. Blows socks off and makes a lot of noise.

1: How much flow/vacuum I need? Is more like vacuum cleaner than wood working dust extractor?

2: Nozzles? I realize that on TCG use no standard nozzle will work, but on surface grinding and wheel dressing much dust is being produced that is pretty stationary service.

2a) Splash guard suction box?
2b) Wheel guard with suction port? original wheel guards do not have suction port and they are pretty basic. I need to make separate wheel guard for surface grinding anyway, suggestions for design?
2c) Separate nozzle for TCG? Just straight/slightly oval pipe with oblong cut?

3: What sort of suction hose I should be looking at?

Thank you,
Pekka

Offline gerritv

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Re: Dust control for TCG and surface grinder
« Reply #1 on: September 04, 2017, 07:08:15 PM »
Attached is a pdf extract from my uncles notebook on dust exhaust etc. He worked at Kiekens in NL in the 50's-70's.

The Deckel S1 manual has other examples of dust collection: http://cncmanual.com/deckel-s1-universal-tool-and-cutter-grinder-operating-manual/

My 1900's Cincinnati Universal grinder came with no wheel guards. I made one using a 3" pipe with segment cut out, hammered into appropriate radius. Once it gets a front plate I will be adding a dust port attached to a cyclone and used central vacuum.
« Last Edit: September 04, 2017, 07:34:43 PM by gerritv »

Offline PekkaNF

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Re: Dust control for TCG and surface grinder
« Reply #2 on: September 05, 2017, 02:00:54 AM »
Thank you.

Nice wheel guard you have, looks like build to last.

That chute looks like is stationary to wheel head, i.e. table moves under it, that would place it closer to debris shower, but might interfere with magnetic table and other small stuff I have on the table. Data looks interesting, if I got it right...125 mm duct and 6,5 m3/min ref. that to wood working chip/dust fan and we are close to 2kW beast. No doubt that would do it!

One friend has small TCG and it has 1,5kW fan with about one metre of 60 mm hose, needs a nozzle close to point but works well.

Got more than enough day job for few weeks, have to build this little by little.

Pekka

Offline gerritv

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Re: Dust control for TCG and surface grinder
« Reply #3 on: September 05, 2017, 07:48:15 AM »
125mm is the wheel diameter (schijf diam). Vin is the expected speed of the airflow. The angle of the chute opening and its length determines the efficiency of airflow. A fairly short chute is more efficient.

With the flex hose (slang) hanging from above you could mount the chute on the table.

Gerrit

Offline David Morrow

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Re: Dust control for TCG and surface grinder
« Reply #4 on: September 07, 2017, 07:03:45 PM »
I have a small CNC mill and a CNC router and I use Locline on both of them. The router creates the most swarf so I would suspect that would be closer to the debris you need to collect. I first tried the 3/4" Locline - in fact I had 2 of them collecting chips about 180 degrees apart. It was just ok. Then I switched to the 2 1/2" Locline and that was a huge improvement. I just connect it to a good sized shop vacuum from Home Depot with some good flexible hose. Don't go too small on the vac - I find that larger is definitely better. You want to keep the hose as short as possible and keep the bends to a minimum as each bend will slow down the flow and therefore its effectiveness. I suspect that the swarf from surface grinding is pretty fine. When I route MDF, the result is pretty dust-like and it can clog the filter pretty quickly. You might want to also look into one of the cyclone dust separators. They aren't too expensive and should minimize the filter clogging problems.

https://www.google.ca/search?q=locline&dcr=0&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjmlYD9lZTWAhUK6mMKHaGVD4sQ_AUICigB&biw=1154&bih=641

Offline PekkaNF

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Re: Dust control for TCG and surface grinder
« Reply #5 on: September 08, 2017, 02:29:24 AM »
Thank you. I was not aware that there is also larger bore lockline.

I'm thinking to clear out surroundings around this TCG and need to relocate some crap/threasure and cabinets to create more defined space for it. I may need to buy some welding curtain to keep the debris at that end of the garage, but not rushing it yet.

If I have any time left I will try to build some sort of Thien separator and try that with shop vac. I have some short pieces of 50-60 mm ID smooth inside/corrugated outside type hose I'm planning of using. Have to test few ideas before building any too grandious palaces solidly on cloud.

When I have dry separator (bafle or cyclone) and air flow sorted I need to consider filter. Then I consider shop vac or fan...I would very much prefer shop vac if I can cope with it.

There is one thing that keeps on coming back: water based coolant i.e. wet grinding....that would solve some problems and create new ones. I'm not thinking of preparing for that one, but somewhat curious.

Pekka