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Member postings for Neil Lickfold

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

Thread: Cyclone Vacuum Separator
31/08/2018 10:49:11

I just use one of those inline Vacuum cleaner ones. What I like about it, is the clearish container. It is easy to take off and empty. If I suck up a little part, it is not so hard to find.

I used to have a bigger 25 L bucket with cyclone thing. But prefer the smaller unit that is easier to handle.

Neil

This is what I have now. My actual one is made by Hoover, this is a knock off, but is the same thing.

https://www.aliexpress.com/item/32mm-Dust-Interceptor-Vacuum-Bag-Cyclonic-Separator-Collector-Dust-Outer-Filter/32669606014.html

 

Edited By Neil Lickfold on 31/08/2018 10:54:09

Thread: clocking in a mill vise. Problems.
27/08/2018 21:09:42

I have a selection of bolts and capscrews with thick washers. They are in 5mm length increments. Keeping things clean is a key to consistency when clamping, especially the T slots, so that swarf does not damage the underside of the clamping area.

Neil

Thread: Bench grinder
25/08/2018 22:08:38

I have found that the hole size of the wheel and that of the shaft, is too loose. I suggest either turning a better inner bush, for the wheel, or using some form of tape, to make up the diameter to a better fit. Once the wheel is in position and clamped it will be good. Cheap wheels need the sides dressing as well as the diameter.

Thread: TNMG1604 Shim
25/08/2018 22:04:50

There are many shims for TNMG holders. So a brand of holder is needed. You can probably by a cheap brand holder for the price of some shims these days.

Thread: Calling all Kiwis
24/08/2018 06:33:51

Carbiidenz I think is the best there is. Particularly because he will sell inserts one at a time, and there is next day delivery as well. Has a lot of things and runs specials every now and then.

Neil

Thread: Setting a Machine Vice Parallel on the Mill
23/08/2018 12:00:44

A great topic Andrew. I have seen where some use a single (pivot) tennon to adjust the vice on. Like you say , it takes less that a few minutes to set to within 0.01mm over the length of the vice. To get better that 0.01mm over the length of the vice, it needs to be clamped with a reference of some descript.

Thread: Calling all Kiwis
20/08/2018 08:26:57

https://www.carbidenz.co.nz/v-coil-thread-repair-set-m3-x-.5.html

he also has spare coils in 1.5D and 2.5D

https://www.carbidenz.co.nz/v-coil-thread-repair-insert-m3-x-.5-x-2.5d-10-pack.html

Very good to deal with. If the order is in by 4pm, it will arrive by courier the next morning.

I could not find spare coils on Jcar website. The V-Coil is German made kit and a very good quality product.

Neil

Thread: Aluminium thread strength
16/08/2018 22:31:46

The BSW thread form is stronger in weaker or notch sensitive materials due to it's radius on the root and crest. The metric and the UNC form, has sharp edges on the crest of the thread form.

Neil L

Thread: Are you a Man or a Mouse When Milling?
13/08/2018 00:50:45

The uneven helix angle and spaced fluted milling cutters work really well on manual mills and the mini mills. They are way better than any HSS cutter as well. The face cutters with the positive geometry uneven spaced inserts also work really well on the mini mills. Got a good laugh from the man or mouse video. Using compressed air with a bit of oil works really well for milling , especially if you adopt the full flute depth of cut with a shallow radial cut techniques. All that you need is some way to stop the chip from being recut again, and the cutter life increases quite significantly. If you also have ball screws or some way to control the back lash, climb milling also increase the cutter tool life as well.

Thread: How to drill holes in ABS plastic without splintering?
04/08/2018 06:21:58

Having support material above and below the part. Negative or dulled off a drill bit like the video is good for plastics. Also withplastic , not too hi a rpm. Otherwise it will want to melt the material. Same for a lot of other plastics.

Neil

Thread: Ring Light for mill/drill
04/08/2018 00:46:29

What a great idea, and really cheap as well.

Neil

Thread: 3-Phase Motor Conversions: Are They All Hype?
31/07/2018 12:23:52

What's your reasoning for not exceeding 70hz on the drive Neil? Most lathes have 4-pole motors which will happily run at the speed of a 2-pole.

I was told that the motors, 2 pole or 4 pole can safely go to 40% over their rated max rpm.

Neil

30/07/2018 20:32:53

Maybe you need to get back to them, so that the person who helped you, finds out that they either messed up, or need more training. Possibly take it further up the chain. The local place here in Hamilton, they will set the drive to suite the motor and the application it is being used for. Really great service too. Companies are only as good as their staff.

Neil

30/07/2018 18:19:44

After setting the motor to the lower voltage option, get the hand book that came with it, and check the current settings, for your motor. From the motor data plate. The drive will generally go from 20hz to 50hz, but is programmable to 400 hz. Don't go over 70hz on the max limit. Some say don't go over 60z,(USA and Canada power frequency). Like others have said, as the frequency drops,so does the RPM, and so does the total power available. Also there is breaking options, and slow down/ decelleration settings. I think mine is like 0.3seconds or something like that, and have the accelleration at the same rate, on the motor start up and shut down.

I am surprised that if you brought the unit as a complete set up ready to run, that they would have the motor not in the correct configuration. I am assuming that your VFD is the 220V 3phase output one, and Not the 415V output one.

I have a microswitch inline on the S1 control circuit. This micro switch I use is a normal closed one, and is opened/broken circuit when the contact is made. It stops the lathe for when I do forward thread cutting. And allows me to turn the switch to reverse to wind back for another threading pass. Really good for internal threads. I have some pictures in my Album with it.

Neil

Thread: Thread cutting with carbide inserts
29/07/2018 12:38:55
Posted by John C on 29/07/2018 10:00:56:

Nick L - please could you give details of your microswitch/ VFD set up? It sounds interesting.

John

So I have an album here, https://www.model-engineer.co.uk/albums/member_album.asp?a=48822

I have the microswitch on S1 one connection. So when the switch (normal closed) is opened, it stops only the forward direction of the motor. Reverse direction still works . I set the VFD to stop in about 0.3 seconds I think, maybe 0.1 seconds. When the switch opens, the motor stops, then I switch to reverse, wind back.and can take another cut. The microswitch is set on a movable stop to set it in the Z distance.

Will add more to the album when I thread cut next.

Neil

Edited By Neil Lickfold on 29/07/2018 12:47:03

29/07/2018 09:19:20
Posted by Old School on 29/07/2018 08:49:29:

Jason, Thanks for the info, I won't have a problem with the chuck unscrewing Myford 254s. I am going to try and make some taps to hopefully solve a problem with leaking taper seat glow plugs on our racing. The glow plugs threads are undersize and this might be part of the problem. I am going to make undersize taps as part of the solution.

The problem you have is that the thread needs to be concentric to the taper seat in the head insert. If you make your heads, bore the inner diameter for the thread form, and turn the taper seat angle as well. Then use a small threading tool to screw cut the thread form. When it is mostly thread cut, you can use a tap to act as a thread chaser. If the tap is run just straight down the drilled hole, often the tap does not start concentric to the hole. I also found, that if the taper seat angle is made a very small amount, tighter on the front, over the nominal angle. I make the Nelson taper seat 34.75 deg instead of 35 deg. With the Turbo plugs, I make the taper 60.5 deg included angle. With bearing blue, the plugs will seal on the very front of the taper seat. Some glow plugs the seat is not concentric to the thread form. Those plugs will always have sealing issues. You can also correct a head, by making a precision thread form and use that to get the head insert concentric to the thread. Then rebore the taper seat.

SInce setting up the myford S7 with a VFD and a micro switch to stop the spindle, it has made doing internal threading quite easy, with confidence to internal thread cut.

28/07/2018 23:08:16

Full form carbide thread cutting inserts are just great. If turning the lathe by hand, like some do, it is essential, that at no point do you move it backwards while it is engaged in cutting the thread. I just have a small run out area and use now use a micro switch on the VFD to stop the spindle when the tool is in the relief area. I also cut the area to be threaded about 0.1mm bigger on diameter. Us a marker pen for colour. I keep cutting until the marker pen is gone, measure the OD of the threaded area, eg 10.05mm and then make another pass at 0.1mm so it makes the OD of the form 9.95mm for a M10X1.5 thread. Works perfect every time. On threads smaller than 6mm I use -0.03mm and on threads smaller than 3mm I make them -0.01mm, so M2 and M2.5 I make them -0.01mm , for M3 -0.02mm , M4-M6 -0.03mm, above M6 , make -0.05mm , all are on diameter references. I buy the full form ground inserts for home. They will cut as hard as 58Rc and will cut all materials I need to cut, The inserts I use for threading Titanium, I only use on Titanium and nothing else. Thread cutting at 90 to 300 rpm is just fine, on hobby lathes. Use a good cutting fluid suitable for the material you are cutting also makes a difference. I either cut slow and dry , or with a flood of fluid to wash away the chips and it gives a good thread form finish. There are charts for carbide inserts for the number of passes in thread cutting. It is like about 4 to 6 passes, depending on the thread depth and pitch etc.

Thread: Any tips for Machining (turning down) a Hardened (60c) shaft on a Myford 7
12/07/2018 22:57:44

I have found that the ccgt 09 and ccgt 06 inserts from kyocera on the myford are best. You want around 400 rpm for the hard skin and then around 600 for the rest. Get the small radius 0.2mm inserts and take no more than 0.2mm cuts (0.4mm diameter ) at about 0.05mm per rev,(2 thou per rev) feedrate. If it gets hot, use water or some coolant on it. I have a picture of the ccgt inserts that I turn bearing races with in my album.

In my experience , unless you can get a 0.2mm cbn and they are expensive, the regular coated carbide will be a far better choice on a Myford lathe.

Neil

Thread: Is this true..?
29/06/2018 23:57:26

The 1.5D or 2.D rule work well for similar strength materials. But a steel capscrew in an aluminium housing that is frequently being reassembled, the threads in the Al housing will last much longer with a 3d thread engaugement . On those we replace the worn threads with 2D helicoils and they are ok, the ones that had the 2d thread in the 1st place. Irony is to get the 2d helicoils in takes the same room as tapping for 3D threads. The 3D threaded ones have not failed after 4 years of service. The 2D threaded ones failed in less than a year. For some materials fine pitch series threads are stronger than the course pitch series.

Neil

Thread: Should a standard turning tool be mounted at a slight angle?
28/06/2018 10:49:23

Loose compound slides, and loose or improperly adjusted cross slides, all add to poor surface finish. I only use the low speed range of the motor to the clutch, so max is like 700 rpm or so. The ground inserts for Al etc work really well like a hss tool. I find that using very sharp tools is the key to a good surface finish, as well as slide etc in very good order.

Neil L

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