Here is a list of all the postings Lynne has made in our forums. Click on a thread name to jump to the thread.
|Thread: Amolco DRO|
Had a look at Mike Crossfield's album ref. magnetic scales. Soon got fed up of having to adjust the screen to see . full picture's. Arc's advert, no problem Lynne .
|Thread: Inverter Tripping RCD|
An interesting discussion. Having read the F_____ manual, it tells me that all vfd's have a leakage current to earth, the levels of which are affected by motor cable length and type, effective switching frequency, earth connection used, and type of RFI filter installed. If an ELCB is used, it must be fitted with a type B device, The vfd I have has an external screw which can be 'removed' if tripping is an issue. Now logic suggests to me, that no mfg. would tell one to do this if transient spikes from whatever source are going to destroy the vfd. There has to be some form of protection built into the drive. But hey ho, I am no electronics buffa. Regards, Lynne
|Thread: Boring tool|
Thanks for all the responses, they make interesting reading. I did not appreciate the function of the star wheel, just did not find it easy to use , so I replaced it. Now I know, wish I had kept it. Lynne
Good Evening. Attached is a photo of a boring tool that I acquired with the mill. It required a lot of fettling for me to be able to use it, and it is now light fingertip control. I carries no name of mfg. and I would be interested to know its origins. Does anyone have a similar one? Lynne
|Thread: vfd question|
I have recently invested in a VFD for my mill, I've been following much of the thread with interest. I now know, that having had a few problems, it must stem from not having sat, and RTM what ever that is; applied logic, though I think that a knowledge of the subject helps the application of logic, and it is certainly not 'pretty simple'. It seems from 'Old Mart's'. assessment, that my not being an electrical engineer, I am not going to understand the manual, and it serves me right. Do the homework and you will not need to ask how to install it. Right. Andrew summed it up very succinctly 'VFD's are pretty straight forward, but you do need a fair degree of 'knowledge' to set one up, and to understand manuals. I am now reluctant to ask a question. Regards, Lynne
|Thread: Exhibitions 2020|
Major events are being cancelled. Nothing on the Doncaster Mex. website to suggest that it is being cancelled. 'No Refunds' is clearly stated. I think its time for a statement to be made. The Govt. have told me to stay in my home and not travel. It is clear that it is going to cost me an 'arm & a leg' so I have already decided that I will not be going to any future exhibitions.
|Thread: Milling Cutters|
Muzzer, I have sent you a PM. Lynne
Thanks for all the help and info. Lynne
Thanks for all your responses. Martin gave me a very clear answer to my main question. My further musing was that pictorially , chinese switches appeared much larger and more complex looking than many uk versions, any particular reason for this. I now realize that the switches I have looked at are in the voltage ranges 220V to 415v. The outputs from the VFD are 10 and 24v. So do I need to look for switches that clearly specify these ranges , or are the others OK to use? I've looked at InverterDrive web, and I cannot see any low voltage switch gear, plenty of 230/240v gear. So some clarity on the subject would be useful for me. Thanks, Lynne
I am looking for momentary switches to build a remote panel for recently purchased vfd. Have been given ebay reference by a fellow member of the group. Many switches are referred to as 1no/1nc or vece vesa. Am I correct in thinking that no/nc is dependant on how they are wired up? Also switches sourced from China appear to be a much larger switch arrangement than switches that are sourced/made in the UK, and I am puzzled, why? Can anyone explain why. Regards Lynne
|Thread: Emergencies / Braking|
Thanks for all your responses. The project is to convert 1ph mill to 3ph, using a 3ph 0.55kw motor I was given some years ago. (It is a runner) No particular emergency in mind, though many years ago my shirt cuff picked up on the spindle of the pillar drill I was using; fortunately the sleeve ripped off. Some damage to the arm, but not major; so I guess that is in the back of my mind. The VFD I am looking at does have DC Injection built in, If I buy , I will leave it at the default setting, rather than mess things up. I think that configuring the ramp down settings will slow things down fairly rapidly, but I still have the current emergency stop to cut the mains coming in, which seems a reasonable route to go down. Regards, Lynne
There were a number of posts, recently, concentrating on vfd/machine
emergency situations, and various approaches of dealing with them..
Purely in relation to the 'emergency' aspect; which is the better to have
Dynamic braking or DC Injection, built into the vfd?. It appears the choice
is one or the other, probably on the more expensive both. Lynne
Thanks for the responses. I will take another look at the quick start guide. Obviously It did not register with me
what it was telling me. Regards, Lynne
Good Afternoon, On/Off switches for remote vfd operation, Should they be latching; is it posible that it depends on the model vfd . I am looking at a Invertec Optidrive E3 0.75 kw range. Lynne
|Thread: 3 phase motor|
John Haine and John Flefcher 1. I will send you both PMs. Regards, Lynne
Thanks to all for the comment. Certainly had a senior moment, the RPM is on the plate. Have put a few pictures in my albums, plate and motor. Change from star to delta is by links, so that is easy. The next bigge is to sort out the VFD, so I may well return on this question. Regards Lynne
Thanks to you all for getting back to me on this .
John, All I can say is that the motor is quite a lump and heavy, though that is probably down to the fact
that it all cast iron body. The mill is a Naerock RDM 350, and what bits of info. I have gathered over
time, does'nt give any info about the motor, so it could well be 1/2 or 3/4hp. I am going to have to take the motor
apart to fit a sleeve to the shaft and machine so can I establish the number of poles fairly easily from
peering inside,but it would be useful to know exactly what to look for. Thanks again, Lynne
Current mill motor single phase, probably 1 hp, but not plated.
Have an Assea 3phase .55Kw motor which I am thinking of using
in conjunction with a vfd. Will it cope? Mill only gets light use.
Would appreciate members input on the feasability of this.
|Thread: Gibraltar Toolpost|
Michael, thanks for the link. interesting, but not quite what I had in mind for the '7'. I like the Aloris toolpost.
I hate Imojis, and I do not visit sites where I know they are mobile>
Rod, thanks for the reference to tubal caine's book. Lynne
Thanks for all the responses. Have read the article in 139, useful detail. Will also have a look at the Hemmingway toolpost. Do not often read M.E so it was'nt there that I saw the article. Regards Lynne
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