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Member postings for AJAX

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

Thread: Suggest a repair method for broken aluminium alloy casting
01/05/2022 21:00:42
Posted by Pete Rimmer on 01/05/2022 18:22:25:

I'd tig weld that for you if you were able to bring it to me in N Kent.

Pete, that's very kind of you to offer; however, I'm going to get some brazing rods and give it a try on some scrap. I'd like to see if I can do it myself as it could be a useful skill for future tasks.

01/05/2022 18:13:34
Posted by Brian Wood on 01/05/2022 18:04:56:

I have made repairs with the aluminium brazing rods which are strong enough in that sort of thickness. They look satisfactory too

I recommend you try them. Be sure to use a stainless steel brush to abrade the joint all round before you apply heat, the brazing torch should be quite adequate, this is not high temperature work

Regards Brian

Thanks for your suggestion, Brian.

Do you think it would be a good idea to grind the crack out a bit before brazing? Vee-groove all round? I could do this quite easily with a rotary burr. As it stands, it would be impossible to clean the faces inside the crack without opening it up somehow. Do the brazing rods work well in filling cracks and if so what is the optimal gap?

01/05/2022 17:49:49

Can anyone suggest a suitable method to repair this broken casting on a foot-mount motor? I would prefer something that looks good and strong (rather than JB Weld and some thick paint) but I would prefer not to invest too much time or money.

20220501-171426 20220501-171447 20220501-171507

My stick welder is not suited to this job but I do have a good propane torch which I only use for heating parts up for assembly/disassembly. I have no experience using aluminium brazing rods. I realise there are cheap brazing rods available online but I'm guessing they are not particularly good.

I may end up pinning the joint, but I may need another look to see if this is possible. Pinning could also be combined with wrapping some flat around the corner and screwing it for reinforcement. However, I don't expect this would look very pretty.

I look forward to your suggestions.

Thread: Single phase induction motor with 6 wires
27/04/2022 21:50:01
Posted by noel shelley on 27/04/2022 21:41:20:

1/22 Hp, not going to do much ? Noel

It's a small geared motor.

50 lb-in torque.

Thread: Need advice on clearing Dads shed
27/04/2022 21:25:37

Don't invite a dealer in. You'll get peanuts.

Sell on eBay. The auction will realise the actual market price for you.

Start at a price that will interest buyers. Don't start too high.

Don't offer a buy it now price. More fees. No value to you.

Wait until the 80% discount on seller fees if you can.

Myford trilever with electronic power feed £699

Small bench pillar drill £39

[Name of machine] powered shaper £399

Etc.

That will get plenty of interest.

If you can, find someone with some knowledge to identify parts. Eg chucks, milling vices, tooling, etc. Don't just give this away with the machines.

Thread: Size of a Boxford metric Lead Screw
27/04/2022 18:04:20
Posted by Hopper on 27/04/2022 12:44:31:

Another possibility to consider is that if it turns out to be a standard metric Trapezoidal thread, you can buy lengths of readymade leadscrew for very reasonable prices but again I forget the name of the UK suppliers discussed in old threads here. One advantage is that the commercially rolled thread is work hardened so more durable than a screwcut thread. But of course you miss out on the fun of cutting your own very long and very thin trapezoidal thread which is only as accurate as the possibly worn leadscrew of the lathe you make it on!

Edited By Hopper on 27/04/2022 12:47:52

I'd be very interested if anyone remembers the supplier name.

Thread: Single phase induction motor with 6 wires
27/04/2022 18:02:42

Admin, please feel free to delete the thread!

27/04/2022 18:01:35

Ignore me... I just realised that next to the 85 degrees it says "c/out". Must be thermal cut out.

27/04/2022 17:59:30

I have a single phase induction motor that I would like to put to use.

The motor is wired with 6 leads. I have probed with a multimeter and found the following:

White, red and yellow appear to be the motor winding connections (2, 4 and 9). The windings measure about 115R each.

The two brown leads are connected together (about 1R6). They are electrically isolated from the other leads. I presume the two brown leads are connection 1 "c/out". Could anyone suggest how these two leads are used? I did wonder if it was "count out" but I've turned the motor over and the resistance does not change. Maybe a thermal trip?

Many thanks,

Brian

20220426-193402 20220426-193413 20220426-193425

Thread: High Speed Bench Drill?
22/04/2022 17:05:49
Posted by Barry Smith 4 on 22/04/2022 12:43:56:

Hi, does any have experience they can share on hi speed bench drills particularly modern (proxon) vs traditional Pollard/Herbert ie old proper drill presses. I will be using it to supliment my belt drive bridgeport which has, like me seen better days when used at high speed.

thanks

Barry

How "high speed" do you need?

22/04/2022 17:05:10

We have about 6 of those little Proxxon drill presses for PCBs. Some are mains powered, others use a brick adapter. I don't particularly recommend them. The chucks are low quality and there is a lot of slop in the mechanisms.

Thread: Got the engraver working
22/04/2022 08:44:15

What material are the labels made from?

Thread: Eagle surface grinder motor and pulley selection
21/04/2022 20:50:41

Pete, I had a look at your album photos and noticed you have added a spindle lock for grinding wheel changes. I was wondering about doing that myself when I inspected the spindle and saw the hole. Do you find it a worthwhile modification?

Another question, I was wondering about adding a slide lock (not yet considered "how" in any detail) to be used when dressing the wheel. Or don't I need one? Last time I used a surface grinder was 35 years ago...

21/04/2022 11:17:21
Posted by noel shelley on 21/04/2022 10:31:29:

Have I missed something or WHY are you digging out star point ? Are you intending to use a VFD ? If so pay special note to the belt/pulley ratio and the resultant wheel speed if using an increased frequence ie above 50Hz ! Noel.

Yes, I'm using a VFD. Frequency will be limited to 50hz. I would have been happy with single phase for this application but I had this motor and it fits the space.

21/04/2022 07:46:19

After looking at the spare motors I had (several would fit, but all were 1420 RPM) and considering the need to change the pulley and belt, I ended up splitting the hard wired Star point on the original motor. This actually turned out to be very straightforward. It took about 1 1/2 hours to do.

Thread: Meddings Dril Tru - What to do?
21/04/2022 07:38:56
Posted by Jon Halland on 14/04/2022 16:38:51:

Hi AJAX,

Thanks for your reply. I just had another look at the threaded cover bar hole in the cast base: the upper 8-9mm has brute force 3/8 x 16 (UNC or BSW) 'thread' and the rest in finer, so no doubt you are right that originally it was a full 3/8x20 BSF. I tried with the lock handle which is 3/8x20 BSF but that now fits worse than a 3/8 UNC. And still it came with a M10x1.5 jammed into the first thread....arghhh.

My reason for trimming the axle was to make it fit a new 22mm bore pulley and use the key and set screw to hold it in place.

Meddings are very helpfull, but many parts are not available. The spindle pulley is available at £100.75+VAT+Shipping.

I am in Aldridge, West Midlands.

Hi Jon,

That sounds like a very expensive pulley to me. I would have thought it should be possible to find one elsewhere at a much more reasonable price. Shame those threads have not been looked after.

Thread: Eagle surface grinder motor and pulley selection
16/04/2022 15:50:27
Posted by not done it yet on 16/04/2022 15:10:50:
Posted by Pete Rimmer on 16/04/2022 14:11:52:

Yes my Eagle motor was 2 pole I fitted a 4-pole and had to make a new pulley to suit. I Went all-in and made poly-vee pulleys.

If you're going to re-motor it watch the overall length of the motor/pulley combination or you'll find that the z-axis screw will foul the back of the motor.

Hi Pete,

Mine most definitely isn’t. Motor pulley is larger than the spindle pulley on mine, which is a series 4.

Mine is probably a series 4 based on what I've seen on the Lathes website. However the table size didn't exactly match the descriptions. It's 21 x 8" with a single t slot.

16/04/2022 15:47:55
Posted by Pete Rimmer on 16/04/2022 14:11:52:

Yes my Eagle motor was 2 pole I fitted a 4-pole and had to make a new pulley to suit. I Went all-in and made poly-vee pulleys.

If you're going to re-motor it watch the overall length of the motor/pulley combination or you'll find that the z-axis screw will foul the back of the motor.

Pete, why did you opt for poly vee pulleys? Was slippage an issue? I've only tried the machine once, and that was at the seller's premises. All seemed to be good.

I'm aware of the z-axis screw issue, and that's why I would prefer to use one of my existing motors which I believe will fit.

16/04/2022 15:44:25
Posted by not done it yet on 16/04/2022 12:41:29:

Are you really sure this motor is two pole? I somehow doubt it.

Well, it's 2850 RPM on the data plate so I would assume so.

16/04/2022 08:00:21

I have an Eagle surface grinder (not sure of the exact model - the bed measures 21 x 8" and the serial number may indicate this is model "4" ) that is currently fitted with a 1.25HP 380/440V 3-phase motor. This is a 2-pole 2850 RPM motor.

My intention is to remove the motor and see if I can dig out the star point and rewire as delta. Alternatively, I have numerous other 3-phase motors to hand which have a nice compact form-factor and will fit the existing space. Newer motors (e.g. 80 frame) will likely foul the lead screw.

Off the top of my head, I have a choice of 0.75 HP, 1 HP and 1.5 HP all of which are 4-pole motors therefore running at 1425 RPM @50 Hz. To maintain the grinding wheel speed I would need to increase the motor pulley size. Under no-load conditions this would obviously work fine but would it perform poorly when grinding? I suspect the higher speed motor would be the better option but as I have some "free" motors the only cost will be my time boring / bushing a pulley from my junk box and trying this out.

Your comments, please.

Edited By AJAX on 16/04/2022 08:00:50

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