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Member postings for ChrisB

Here is a list of all the postings ChrisB has made in our forums. Click on a thread name to jump to the thread.

Thread: VFD Cable Supplier Recommendations
21/06/2022 13:42:25

This **LINK** is the cable I got for a 1.5kw motor and Invertek VFD. I went with 2.5mm wire but 1.5mm would have been just as fine. You don't mention the power for the vfd and motor?

Thread: Info' that might be of use to Warco Lathe owners.
21/06/2022 13:21:05
Posted by Bo'sun on 21/06/2022 11:49:38:

From OP,

Oops, should have read 0.18mm. Thanks for your observation Clive.

Yes, I agree with other posters that 0.018mm is insignificant.

However, I am concerned about finding loose screws.

My understanding is the screws are loose on purpose, just to take up the slack. I only noticed they were loose when I had to take the carriage apart due to a crash. Didn't think much of it at that time, thought they must have come loose during use, but tightening them down during assembly the carriage got stuck. So I reasoned the clamp should have been shimmed, and that's what I did. Probably it was not necessary as some have commented.

20/06/2022 22:01:16

Don't get me wrong, I'm quite happy with my lathe. It does what I need and more. But if you look closely you'll find it's a bit roughly finished, still happy considering the price.

20/06/2022 19:31:38

Posted by SillyOldDuffer on 20/06/2022 18:58:51:

Accuracy is provided by the polished top of the prismatic bed, on which the saddle is machined to accurately slide, not the rougher surfaces below.

Dave

Have you ever had a look at the mating vee groove in the carriage? If I had to cut it with a hacksaw I would have probably done a better job!

Thread: Is there an alloy that looks like copper but isnít?
20/06/2022 18:15:49
Posted by ChrisB on 19/06/2022 22:33:54:
Posted by ChrisB on 19/06/2022 18:30:59:

Interesting subject! I have also often wonder what this hard copper colored material could be...I work for an aircraft maintenance company and one task is the inspection of the pylon to wing attachment spigot. The spigot is protected by a sleeve which looks like red copper but it's extremely hard wearing compared to normal copper. I had found the material spec but could not find any hits online, I'll look it up again and post it.

The material it's made from is S07-7001, but I can't find anything.

Ok I finally found the material spec, S07-7001 is BAE material BAEM 7001, which is CuBe 1.9, so it's a Beryllium Copper alloy. Wonder what it's worth as we scrap quite a lot of it.

Thread: Info' that might be of use to Warco Lathe owners.
20/06/2022 18:07:09

My WM280 had the same issue, so probably they are designed that way. I put shims under the clamp until I could feel a slight drag when sliding the carriage by hand and tightened it down.

Thread: Is there an alloy that looks like copper but isnít?
19/06/2022 22:33:54
Posted by ChrisB on 19/06/2022 18:30:59:

Interesting subject! I have also often wonder what this hard copper colored material could be...I work for an aircraft maintenance company and one task is the inspection of the pylon to wing attachment spigot. The spigot is protected by a sleeve which looks like red copper but it's extremely hard wearing compared to normal copper. I had found the material spec but could not find any hits online, I'll look it up again and post it.

The material it's made from is S07-7001, but I can't find anything.

19/06/2022 18:30:59

Interesting subject! I have also often wonder what this hard copper colored material could be...I work for an aircraft maintenance company and one task is the inspection of the pylon to wing attachment spigot. The spigot is protected by a sleeve which looks like red copper but it's extremely hard wearing compared to normal copper. I had found the material spec but could not find any hits online, I'll look it up again and post it.

Thread: METAL DUST & VFDs
04/05/2022 15:22:49
Posted by John Doe 2 on 03/05/2022 10:21:13:

Can I just say, ChrisB, what a nice installation you have built there ! Good engineering to keep the heatsink cooling air completely separate from the electronics, and well done for lining up the front panel with the circuit board switches - that must have taken a couple of attempts.

And proof, if it were needed, that the front panel switches of a VFD are not designed for heavy use - you can see (the five yellow dots near the readout display); they are just tiny circuit board switches, not designed for heavy regular workshop use.

Thanks John. Yes alligning the front panel to the buttons was a pain, an exercise of measure a thousand times, cut once and trim a bit more!

I wanted the vfd to be easy to connect and disconnect because I plan to use it for other machines I plan to build, and good quality vfds don't come cheap!

04/05/2022 15:13:03

I can't think of a time where I produced dust finer than talc when using my belt grinder. When I sweep the floor I normally gather grit from the belts and whatever material I was grinding...can't say the metal is dust, it's more of a grit - definitely not going through a sealed enclosure such as an IP54.

Of course you can get a better rated enclosure, you can immerse it in sealant, you can extend the wiring and place it in the attic etc etc, whatever makes you happy, but I am of the opinion that for a normal workshop use, there's no need of anything higher than IP54.

03/05/2022 14:21:35
Posted by Robert Atkinson 2 on 03/05/2022 12:45:16:

Just a note, IP54 only provides protection against limited amounts of dust. It is not generally adequate for electronics in a machine shop.
The fundamental issue is that almost all VFDs are components and need to be installed in accordance with the instructions. The instructions are intended for qualified competent persons. Virtually all VFDs need to be enclosed with proper protection, earthing cable strain relief etc etc.

Robert

G8RPI.

True IP54 is not totally dust proof, but it is more than adequate for a workshop setting. Limited protection against dust means that the amount of dust which can enter will not interfere with the correct operation of the device. If we take the Invertec VFD for example, the commissioning instructions recommend that an IP20 VFD is installed in a pollution degree 1 environment (ie a clean room/lab environment). If it is to be installed in a pollution degree 2 or higher a minimum IP54 enclosure is required - that is quoting the manual. So it all depends on your VFD and what it's rated for. There are even IP66 rated VFD's for outside use.

03/05/2022 05:51:24
Posted by Speedy Builder5 on 02/05/2022 21:14:16:

Why do you want to protect your VFD - you won't live to see the VFD die if the dust is as you say. First job is to put an extractor on the linisher !

Bob

The OP's question regards the VFD, we can side track and discuss ohsa but it's not what he asked...maybe he does take care of all that. Personally on my machine I dont have dust extraction so I wear a full face mask. I don't want all the grinding dust all over my machines (which are vfd powered as well) so I grind in a small separate room.

Regarding cooling of the enclosure, if I had to put an cooling fan to it I think I'd rather make it to push filteted outside air in the enclosure rather than the other way round and extract air from the enclosure. If the fan is extracting air it's going to create a negative pressure inside the enclosure and out side unfiltered air will try to get inside from all crevices you might have even though there is a filtered inlet.

02/05/2022 15:09:53

Depends on what type of VFD you have, there are VFD's which do not require any dust protection because they are already protected from the factory but they all come at a price premium. These are IP54 and over, the most common type of VFD is IP20 rated and this will have no protection against dust and anything coming out of your grinder.

I have 50x2000mm belt grinder powered by an IP20 Invertek Optidrive E2 VFD, it's fairly expensive so I made a totally sealed enclosure for it. The enclosure is a pelicase in which I fit the VFD and it's controls. I took off the original case of the VFD then ducted the heatsink and sealed it from the out side so that there is no exchange of air to the case. The cooling air just flows through the heatsink.

Some might think the enclosure is too small and it will over heat, but in reality the enclosure plays no part in the cooling capacity of the VFD, the heatsink does. I operate the grinder in +35degC ambient temperatures.

Some photos of the setup which could be adopted to other types of VFDs.

The Invertek Optidrive E2 VFD as originally purchased

20210826_125418.jpg

Pelicase enclosure - I transferred the original display to the enclosure and installed the controls.

20211105_111036.jpg

The heatsink is ducted and totally enclosed, so the air flowing through does not enter the case, it just cross flows through the heatsink from one end to the other.

20211105_111107.jpg

The VFD minus it's original cover.

20211105_111130.jpg

The plug connections power in for the VFD and power out to the motor.

20211105_111707.jpg

Thread: 75mm x 2000mm Belt Linisher Build Thread
01/05/2022 21:44:02

Hey Martin good progress, looking like a fine build! I have a 50x2000 belt grinder, as for belts I think it depends what you're going to use it on. For hard steel I use ceramic belts 40 grit for stock removal and then finer ceramic belts up to 100 grit for a finer finish. Then a Trizact 100 grit for finishing. Good brands such as VSM, 3M and Norton, but there are lots more which are fine as well.

Thread: Magnetic DRO-S7
25/04/2022 18:43:33

Not sure how the S7 compares with a WM280 sizewise. For what it's worth, I have fitted a magnetic dro under the cross slide without any modifications to the slide. The magnetic tape can be attached without the profile directly to the slide as its flat and rigid. The other readout I installed the readhead under the carriage with the magnetic tape glued in between the ways. Works fine all the time and it's never in the way...infact you could hardly say there's a dro installed.

20190803_123436.jpg

Readhead at the back of the carriage.

20190803_112123.jpg

Magnetic tape glued to cross slide under side

20190803_123559.jpg

22/04/2022 06:58:23

Is there a way you can calibrate the reader? I built my own magnetic dro read heads from scratch using components from RLS and an interface from Yury. The interface lets you calibrate the reading against a known dimension such as a 123 block or gauge blocks. Is there any such function in yours?

Thread: Fitting DRO
10/04/2022 15:29:10
Posted by Mike Hurley on 10/04/2022 09:29:17:

Glass or magnetic? if glass, then yes you can cut to size.

regards Mike

Not so sure about that. Magnetic scales can be cut with ease, a sidecutter would do, a glass scale for sure will not be that easy. Maybe a diamond cut off wheel?

Thread: VFD - which is best please ?
04/01/2022 13:49:06

Posted by br on 30/12/2021 17:06:26:

Son needs a VFD for a 3 phase motor to use on his Myford 7.

Totally confused by all the different ones so any advice as to most reliable make appreciated please.

Thanks

bill

My lathe a Warco wm280v came with a Delta vfd which has served me well. I have recenty built a 2x72 belt grinder and used an Invertek vfd, this is more expensive than the generic cheap chinese vfds but it appears better built. You might want to build an enclosure for it to limit prevent dust and swarf damaging it.

You can get Ip55 rated vfds but it they are expensive. I opted to seal mine inside a pelicase and duct it's heatsink out. A belt grinder generates a fair amount of metallic dust so it makes sense to protect your vfd, on a lathe placing it away from direct path of oil and swarf should be enough.

Hope this helps.

The vfd as purchased: INVERTEK Optidrive E2 ODE-2-22150-1KB42 1.5kw

20210826_125418.jpg

Enclosure in sealed pelicase.

20211105_111036.jpg

Heat sink isolated from the case and cooled with external air.

20211105_111107.jpg

Thread: 75mm x 2000mm Belt Linisher Build Thread
05/11/2021 13:46:54

Looking good Martin, it looks like it's a lot of work! This summer I built a 50x2000mm (or 2x72" belt grinder of Brian House kits. Much simpler than what you're building tho. What VFD and motor are you using?

Thread: WM18 spindle heat
01/10/2021 14:49:10

Any one replaced the bearings on their WM18 yet? I'm tempted to take it apart and at least inspect the bearings, but my gut tells me to leave it alone once it's not making any noises and rotates freely!

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