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17th June 2020, 09:56 AM #1171.
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In places like mens sheds I reckon the safest tack is for a centralized DC to be switched on before the first dust making activity and stay on all day except for breaks like smoko and lunch. For something like a ClearVue, the 60c/hr running cost is cheap given the benefits. Same with Evap ACs (just the fan on low speed in winter) as this clears all the fine dust out from even large sheds from hand and power tools.
I solved my own VFD noise problem by fitting a thermal switch on the VFD’s own cooling fan ( an idea that I think you may have given me?) and this reduced the DC noise to a low rumble.
Most of my Powtran VFDs only make a noise when the motor is running but I'm not worried about VFD noise. It's the hissing noise from fast air flows thru open ports that irritates me. The DC VFD is Huanyang so fan is on all the time but it is very quiet, 1m way from this VFD (with VFD on but DC not running) the noise is <50bB.
With the DC running at 50Hz, the air flow noise say 1m away from the open lathe BMH is over 80dB and I find I have to wear muffs when turning.
So that the DC doesn't take too long to accelerate from zero rpm when I leave the DC on I usually drop the frequency to 40Hz. The loudest air flow noise is thus reduced to ~70B for the lathe BMH open. Even this is annoying so I usually switch the gates away from the lathe to a more throttled machine (like the bandsaw or Table saw) which quietens the air flow noise to <65 dB.
BTW for a given ducting/fittings air flow path - noise is an indicator of flow, the noisier it is the greater the flow.
For general ventilation I have a a couple of squirrel cage fans which are much quieter.
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17th June 2020 09:56 AM # ADSGoogle Adsense Advertisement
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17th June 2020, 10:10 AM #1172
3 out of the 4 are doable, mitre saw usage prediction will involve an extended study (say 5 years) of your power tool usage patterns factoring in variables like red wine consumption and severity of hand tool injuries. I'll set up some cameras and swearing recorders on the weekend.
Those were the droids I was looking for.
https://autoblastgates.com.au
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17th June 2020, 01:21 PM #1173GOLD MEMBER
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- Jun 2005
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- Helensburgh
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- 7,696
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17th June 2020, 08:21 PM #1174
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18th June 2020, 01:48 PM #1175
88B0FA44-669C-4442-9AA3-466CD9673116.jpeg
Job done! I have connected the shop 150mm ducting to the mitresaw cabinet and used a bell mouth which started life as an electrical conduit bell mouth. Because it is mostly a single operator workshop and therefore I will only be using a single machine at any time, I have used the overhead boom duct and its associated automated blast gate which would normally be parked waiting to be connected to the mobile machines. Its parked position will now be connected to the mitresaw. IF the DC is already on, then the gate opening time is about 3 seconds which is well less than the time taken to place AND CLAMP the piece to be cut.
Now, if I knew how to post a video, I could show you how effective the hood is.
Now that I have the dust collection sorted, I am trying out the new saw and, so far, I am very impressed with my new Kapex KS60a rock is an obsolete tool ......... until you don’t have a hammer!
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18th June 2020, 04:04 PM #1176
IF this video loaded or, through the dark mysteries of IT gobbledygook is somehow available, what it shows is a handful of dust and swarf thrown into the cabinet but being picked up immediately by the 150mm bell mouth.a rock is an obsolete tool ......... until you don’t have a hammer!
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18th June 2020, 04:24 PM #1177.
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It didn't load for me but here is the link in case others cannot see it
Mitresaw dust collection on Vimeo
Comment - looks real good!
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18th June 2020, 04:59 PM #1178
Thanks Bob, as I said in the earlier post, I simply threw in a handful of dust and swarf which seemed to immediately disappear into the orange bell mouth. I also did the paper ribbon test ....
DB876E9E-3F1C-45D7-9D9A-E70EAC38709B.jpeg
...... and it was pulled in across the whole plane of the opening.
Im pretty pleased with all of that.
Now, back to work?a rock is an obsolete tool ......... until you don’t have a hammer!
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19th June 2020, 12:55 AM #1179GOLD MEMBER
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- Aug 2007
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- Saskatoon, SK, Canada.
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Congrats. You might be among the few that have an effective dust hood for a mitre saw.
Question. If the bell mouth were flush to the side of of the box rather than sticking into the space would it be more efficient?
Pete
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19th June 2020, 05:49 AM #1180.
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19th June 2020, 09:16 AM #1181
Strange you should say that Pete! Late yesterday I did a few more trials using the extremely unscientific method of throwing in handsful of fine dust and there seems to be a ‘dead spot’ against the left-side wall on the operator side of the bell mouth. I had cobbled together a collection of 150mm PVC duct pieces to get to the most convenient point to join the shop system and this ‘Steptoe’ arrangement is just a poofteenth short so it actually suits me to enlarge the hole in the hood wall and push the bell mouth through to the front flange? I’ll report back.
Bob, what on Earth are you doing up at that hour? We all respect and appreciate your input to our projects but I assure you that we CAN wait that few extra hours for you to get some sleep!a rock is an obsolete tool ......... until you don’t have a hammer!
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19th June 2020, 09:56 AM #1182.
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Long story.
Yesterday I decided to change the kitchen tap. The old one leaked at the mixer and the tap head was split in several places with one split strategically placed so that it squirted the tap usr in the eyes if the water was turned on too far. SWMBO had bought a new tap many months ago and had started leaving the tap in places where I could not ignore it eg next to my dinner plate.
Changing the tap involved removing the corroded in place old taps.
Worse still the underside of the sink looks like this.
As well as the usual taps and Dishwasher connections, the tangle also contains of sediment and carbon water filter for drinking water, and to feed a reverse osmosis (RO) filter and reservoir/tank for the coffee machine. The RO water also feeds a Deionising cartridge to produce water clean enough for my chemistry experiments!
CMwater.jpg
My alternative was to remove some of the tangle or work in amongst the tangle and I decide on the latter. This resulted in me needing to lay down on my back with my arms in the air and wield various spanners etc. Of course one never has the right sizes of spanners etc so I was continuously getting up and down and going down to the shed. In the end I found it easier to cut through two of the old tap copper pipe connectors as I just could not get a spanner in there
About half way through the process (I had just finally removed the old tap) I got up too quickly and suffered blood pressure issue which saw me laying on the bed feeling decidedly ill for a couple of hours. Eventually I fell asleep and over slept. (BTW I did finish the job). That evening I still went to bed at my usual 7:30pm so of course I was awake at my usual 2:00am. Usually I listen to the radio or music via ear phones and eventually drift back to sleep till ~5:30am but this time I was feeling quite awake so I got up and had a cup of tea. I did go back to bed at 4am but no sleep unfortunately.
Back to the original topic. Chucking a handful of sawdust dust into the hood is a fair analog for fine dust removal but for chips one has to see the trajectories produced by the machine doing the cutting. At least one can see see any left over chips so if there are none or few left then it'w working.
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19th June 2020, 10:05 AM #1183
Bob, only YOUR sink could look like that!
Im glad you’re feeling better.a rock is an obsolete tool ......... until you don’t have a hammer!
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19th June 2020, 10:19 AM #1184.
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Thanks
The kitchen cupboard under the Coffee Machine has a similar look (and a VFD).
VFD install summaries
The price I pay for occupying this much space is I have to make SWMBO Cappuccinos on demand.
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20th June 2020, 03:16 PM #1185GOLD MEMBER
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Hi there Mr Fletty. I have just finished reading this thread (not all at once but I started right at the beginning!) and thank you, and all the many contributors, to a most enjoyable journey. I must confess to getting a little lost in the VFD discussions but overall this has been most entertaining and educational. My dust collection has a long way to go - have you had any success with collecting from a wood lathe? Keep up the good work.
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