Early myford super Seven parts identify plz

[DMRParticipant @dmr]

Hi Piero,

1) No new photo's on this site. Have you put them in Photobucket or something else?

2) Your stated list of gears is not a Myford one I recognise. You have listed 45t twice separately, is that an error? Your list does not fit the non-gearbox selection either.

3) A picture of the banjo may reveal what the set belongs to. Is there a label one the box? Is there a number on the box?

4) You stated at the start that the 30t was 1/2" wide. Are they all 1/2" wide? Myfords are 3/8" wide.. Do they have a keyway cut? Are there any holes in the gears near the middle besides the centre hole?

5) Have you obtained a replacement leadscrew and fitted it?

6) Have you rebuilt the gearbox and had it working?

Is there anyone near this chap in St Albans willing to help him out?

Regards

Dennis

[Piero FranchiParticipant @pierofranchi37209]

Hi Dennis

 

For some reason the photos would not show in the album, when I went to edit it, they were there,

went back out of the album and they were gone again, uploaded two more photos to this album and they dissapired again,

so I deleted the album and done a new one, this times it all seems ok

 

I had taken a photo of the part number (but obviously that didnt show either) but its there now

 

rebuilt the gearbox (you can see this on one of my albums) and its all working as it should.

To be honest, I have never had a problem taking stuff apart and putting it all back togeather again, it comes quite natural to me, 

 

Its the stuff I have never set my hands on that I could do with the help on 

 

Piero

Edited By Piero Franchi on 03/12/2017 17:30:35

[DMRParticipant @dmr]

Hi Piero,

Well you have a later Myford Metric Conversion Set there. The label clearly states part number 1481/1 but also mysteriously states "For QC2495 and onwards". "QC" stands for Quick Change. I have always understood that gearboxes from QC2501 were the later pattern.

Anyway, you have the later gears set which is not ideal for your gearbox. I think you may have counted teeth wrongly, for instance the one cog in the layer with the change gear quadrant (or banjo) I believe is 30t. and you list 2x28t and no 30t at all. There is only one 28t in the set and unlikely to be use for 2. However, my set only consists of 12 gears and your set has 14 but, as I said before, some gears may have been added and there is evidence of different paint colours!

To cut metric threads with some accuracy you replace the fixed gear set inside the changewheel cover with the quadrant in the box. The circular hole in the quadrant fits over the gearbox input shaft. The two shafts in the layer with the quadrant need fitting first (remove the nut, sleeve and washer first) as they go into the back of it. All is clear if you have the pictorial of the quadrant that I stated in my previous post of 28 Nov.

Do you actually have the 12 gears that I listed in that post? If so, how many teeth do the other two gears have? Another complication to answering your problems is that my Metric Set is on three layers in its (original) box, but the layer with the quadrant is the same as yours. Do all 4 layers fit inside the original Myford box or do only 3 layers fit? We could talk about this better if you PM me your e-mail and I can supply tables of cog set-ups which will work for your gearbox. But you do need a few extra gears to be able to cut all threads.

Lastly, your opening question and pictures included a washer with a keyway cutout. There should be two of those included in the set, 50thou thick. The shaft in those pictures may be the same as the 2 shafts in the layer with the quadrant piece, and if so is a spare. The 30t in the pictures is not Myford if it is, as you stated 1/2" thick. Do not be tempted to try and use it with the metric set.

Dennis

[HopperParticipant @hopper]

+1 on Brian Wood's book "Gearing of Lathes for Screwcutting". I just got my copy and it goes into quite clear detail on the various gear trains to be used with Myford QC gearboxes to either convert metric to imperial, or imperial to metric. Also to cut BA, Holtzpalfel (sp?) and metric and imperial worm threads to match standard gears.

It is I believe the definitive book on the subject.

Gearing for all alternatives is laid out in easy-to-read charts. So that might be easier for you.

[Piero FranchiParticipant @pierofranchi37209]

My Metric set has four layers (as stated by DMR)

they all fit into its original box, so I would guess it was a four layer box set.

The gears I have mentioned are correct as to what I have in the box set.

Yes there is always a chance some of the gears have been lost and others added.

I am defiantly going to be looking into purchasing the Brian Wood book on gearing.

I am relying here on the forum rather than by personal email ONLY incase there is important information shared here that could help others.

If you (DMR, or any other) wish to send anything outside of this topic, plz feel free

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