Here is a list of all the postings John Baron has made in our forums. Click on a thread name to jump to the thread.
|Thread: A matter of trust...|
What is wrong with using a broken carbide pcb drill ?
|Thread: bridgeport 2 speed motor and VFD|
There should be a rating plate on the motor giving 440/220 volt and star/delta connections. It needs to be wired in delta to run on 220 volts, from a VFD.
|Thread: marking / layout blue|
A small tube of Prussian Blue artists oil paint diluted with linseed oil and white spirit works well but it takes a long time to dry off. Though personally I prefer to use a permanent marker.
|Thread: Change Gears|
Thank you Simon,
Message received OK.
|Thread: Tool i/d and Mitutoyo vernier advice please.|
Wow $20 for a straightened out paper clip.
|Thread: Change Gears|
Yes that is right. For all the years I've had this lathe, I've never had occasion to do anything with the change wheels other than turn the fine feed one round.
Actually if the device is the one that I think you are talking about, as shown in the few sample pages, I tried to buy the book from ARC and was told that they didn't stock it. ?
|Thread: Machine registry|
Well 3D printing of guns and making the plans illegal has the authorities rattled.
|Thread: Change Gears|
I would love to just borrow one, but just as happy to buy.
PS. I've no idea how PM works.
Thanks, I have dropped them an Email. Probably wont hear anything now until Tuesday.
Annoyingly I have the set of change wheels that came with the lathe when I bought it brand new ! I've never used them, the gearbox has always had what ever I needed. Except in this case.
I've not been able to fit any of the gears that I have onto the existing banjo to get what I need, which is four threads on a 9 mm piece.
Now that I have digested the help that I was recently, so kindly given about cutting a 1 mm thread on my S7 lathe. It seems that non of the usual suspects have any stock of the 33 and 34 tooth change gears.
So my question is does anybody want to either loan, sell or point me in the right direction ?
|Thread: Bench grinder|
The usual issue with vibration is out of balance wheels, have you tried truing the stones with a dresser. I have a diamond one that I bought. After using it the vibration almost completely disappeared.
Just re-read your post. You really need to make some guards for the old one.
Edited By John Baron on 25/08/2018 12:03:17
|Thread: Spring steel strip|
If you strip an old car window screen wiper blade apart you will find two, probably suitable strips of spring steel, one on either side of the rubber blade.
|Thread: small DC motor|
I have a 220/240 volt AC 50Hz motor with around 15 rpm (I would have to check exact speed).
Unfortunately because it is an AC syncronous motor you will not be able to alter its speed it is very difficult to slow the motor down by loading it. Any use to you ? Maybe the gearbox ? Its yours if you want it. I don't remember why I kept it.
The only other suggestion is a car wiper motor. I use one for the table feed on my mill.
I would guess 24 volt 3.4 Amp using the first part of the number.
Try putting 12 volts across it and see if it complains. Or if you have a variable voltage PSU with an ammeter, using that would give you some idea.
|Thread: Myford S7 Gear Confusion !|
Many thanks for the links and advice given. It is very confusing when the chart and the gears indicated don't match what is actually fitted to the machine.
Swapping the 24 for 34 is probably least trouble. I actually only need four turns of thread.
I have a Myford S7 with gearbox and power cross slide.
I want to cut a 1 mm thread ! Easy, no, I'm getting very confused by the plate inside the end cover, which gives mm pitches and refers to the gear on the gearbox shaft. The plate gives gear "X" as 60 teeth and gives change gear sizes along with gearbox settings for 1mm pitch thread.
The gear "X" on my lathe has 72 teeth ! Am I supposed to remove it and replace it with the 60 tooth gear ?
Thanks in advance:
|Thread: M300 Suds Pump with inverter|
Ops, scratch that ! Getting confused by the power in wires. Sorry.
Looking at that picture, I would suspect that all seven connections are there. It seems that it has been wired on one side of the terminal block. Lifting the wires and checking with an ohmmeter would confirm that.
|Thread: EMC filters for VFDs?|
Assuming that the VFD meets UK/EU legislation it should already have mains filtering built in !
As far as screened cables on the output side, yes I would use them. In Industry they would have armoured cables to the machines anyway, which are earthed and would automatically screen them. Output filters are not advised, since the relatively high frequency content could become distorted and cause other problems particularly with vector control drives.
Just about every old automatic washing machine will have a suitable filter in it. It will be directly connected to the incoming mains lead. Some will have spade terminals, others will have the wires embedded into the case. The case is normally secured directly to the earthed machine frame. The current capacity varies, commonly 6 to 8 amps, though I've seen some as low as 4 amps.
The older ones look like motor capacitors, the newer ones tend to be potted in plastic cases.
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