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15th April 2022, 10:43 PM #46GOLD MEMBER
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15th April 2022 10:43 PM # ADSGoogle Adsense Advertisement
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15th April 2022, 11:45 PM #47.
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16th April 2022, 01:43 AM #48GOLD MEMBER
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Just pointing out that a 5kw motor requires a VFD that is larger than 5kw (at least 6.25kw).
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16th April 2022, 09:10 AM #49.
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Good point, but presumably on a quality machine the manufacturers have overspeced the motor.
Typical motor powers used on 12" combo machines is 3HP so a 16" machine should work OK using 4HP, With the VFD limiting the OPs motor to 5.3HP I cant see any probs.
Of all my machines on VFDs only the DC uses close to their original full motor powers at typical max loads @ 50Hz.
I've overspeced the motors on most of of my machines but this is to typically to make more power available @ <50Hz. The two motors I wish I could get more power from at low RPMS are my 2, 1HP GMF grinders but replacing their motors with those of higher power.
Only the DC @65Hz uses its full motor rated power (4HP motor on a 5HP VFD) but it's too loud inside the shed for me to use it so I limit the speed to 60Hz.
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18th April 2022, 07:11 AM #50
Are you over thinking the cost of installing 3 ph power?
Dom
In respect to connecting 3 phase power to your premises ...
How much spare capacity is in the existing conduit connecting your house/shed to the power pit?
If you already have 2 phases connected (2 active + 1 neutral) pulling a new 4 core line (3 active, 1 neutral) through the existing conduit should be both doable and very little upfront cost. And a heck of a lot easier than mucking about with trying to debug a 3-phase electro-braked motor running via a VFD. (40 years ago, my father installed 3 phase to his house -- to run an air con unit -- by pulling a new four-core cable through his existing underground conduit. The cost of installation was just the cost of the new cable plus the new connection.)
Of course, if the house+shed only has single phase connected, the existing conduit size might be too small to pull two additional cables through it.
But then runnmng a high current draw item could compromise the electrical safety of your entire house/shedregards from Alberta, Canada
ian
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18th April 2022, 10:42 AM #51GOLD MEMBER
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Yeah if it were that easy I definitely would have connected three phase power. I was told by the Sparky that I needed 50mm conduit for 3phase and that my house only has 32mm. So i'd need to run new conduit and while i haven't gotten a quote yet, I imagine running 25m of undergroud conduit and under 6m of sloped driveway would be difficult/expensive. Otherwise, as you say it's just the cost of the new line and the connect/disconnect fee ($1500-) by the electricity provider- so around $3000-3500 total without the conduit.
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24th April 2022, 11:30 AM #52GOLD MEMBER
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Last update. The machine is working fine on the VFD. I havethe VFD set to stop the cutter in 2.5s now and not getting any over-voltage issues so could probably go more agressive but I don't see the point as that is quick enough.
I bought, connected and programmed a switch to turn the machine on/off at the machine and that was easy to setup and works great. I attached magnets to the back so i can attach it anywhere on the machine.
20220423_090532.jpg
Also just fitted a 500mm felder extension which should work nicely and waiting on a 1m extension with leg for the outfeed - which will really help with the 3.6m tops I need to make.
20220423_090507.jpg
So all in all i'm happy and thanks again for the advice amd help.
Cheers, Dom
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24th April 2022, 12:35 PM #53GOLD MEMBER
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so didn't have to do anything to the brake?
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24th April 2022, 12:50 PM #54GOLD MEMBER
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24th April 2022, 01:54 PM #55.
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Does that machine have motor drive on the thicknesser?
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24th April 2022, 08:17 PM #56GOLD MEMBER
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25th April 2022, 01:55 AM #57SENIOR MEMBER
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25th April 2022, 10:39 AM #58GOLD MEMBER
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It cost about $580- for the extension, $130- for the mounting bar, and $45- for shipping so $755- in total. The longer 1000mm extension will be another $900 odd with the bar and shipping.
I looked at the Aigner extensions and have been considering getting one (two month wait on the Felder) but they don't look as robust as the Felder extrusions and don't appear to have the adjustments or as solid a clamping system - how do you find them? Would they do a great job as a Jointer outfeed table? Are they perfectly flat, strong and sit nice and flush with the outfeed? The Aigner would be about $400- shipped so would be significantly cheaper too.
Cheers,
Dom
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25th April 2022, 10:40 AM #59GOLD MEMBER
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Oh, and as for the 500mm extension. It obviously does flex a little if you apply force at the extremity, but I think it will be helpful for face planing longer boards and I think they are rigid/stiff enough to do a good job of this.
Cheers,
Dom
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25th April 2022, 10:54 AM #60SENIOR MEMBER
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The Aigner is great for jointer outfeed imo.
These don't have to be inherently flat and stiff so the same degree as a cast iron jointer surface as long as they aren't causing the board to lift, the main area for accuracy is your main tables being flat, these tables are just there for added support rather than reference surfaces. In saying that, with my straight edge I can't see any light under it so that works enough for me. I mounted it similar to Brian in this thread so that was the hardest bit.
Aigner Extensions - How do they adjust?
Aigner tables
When I added the bar to my bandsaw to use the same aigner table, i put two set screws in the top surface of the bar that I can adjust up/down to get it perfectly level with the cast iron bandsaw surface.
here is some DIY inspiration for you if you want to go down that route. Hammer A3-31 Custom infeed/outfeed tables
Craftsman hardware here in Australia stock the Aigner tables. Price has gone up a bit since I got mine but that is happening everywhere.
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