My new super 7

This topic has 12 replies, 6 voices, and was last updated 6 February 2014 at 14:50 by Roderick Jenkins.

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5 February 2014 at 18:35 #142951
christopher lesutis
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@christopherlesutis88732
Hi folks,

Got my first Myford Super 7 this week with the nice gearbox! I am fairly confused about how to engage my leadscrew? Its a simple mater on my ml10 but the gearbox has confused me?

The only way it seems to work is with the gearbox engaged and that just seems to cut threads? Does the screwcutting gearbox have to be disengaged for it to operate alone? Help!

Thanks!
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5 February 2014 at 18:35 #7030
christopher lesutis
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@christopherlesutis88732
Engage leadscrew for the saddle to work without screwcutting?
5 February 2014 at 20:01 #142961
mechman48
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@mechman48
Any chance of some pics?

George
5 February 2014 at 20:15 #142964
John Stevenson 1
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@johnstevenson1
Turn the intermediate double gear around on the drive tran.

One way to screw cut, one way for fine feeds.

middle gear of the bottom 3, flick the link up, reverse it and drop the link down again.
6 February 2014 at 07:11 #143016
christopher lesutis
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@christopherlesutis88732
Thanks for the quick reply! will get some photos of the lathe up. will try the gear when im home from work, looking forward to making something
6 February 2014 at 09:02 #143021
Lambton
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@lambton
Christopher,

I suggest that as the Super 7 is new to you that you buy a copy of "Myford Series 7 Manual" by Ian Bradley as it contains virtually all you will ever need to know.

Although "The Amateurs Lathe" by L. Sparey which is often recommended reading is a good book however it only relates to the early Myford ML7 which is quite different to the Super 7.

Best regards

Eric
6 February 2014 at 10:28 #143031
Erik Wapenaar
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@erikwapenaar21806
Christopher,

the instruction on how to change to fine feed is written on the gearbox chart as you can see on these picture on Tony's Lathes.co.uk website:

Erik

Edited By Erik Wapenaar on 06/02/2014 10:29:48
6 February 2014 at 12:59 #143050
christopher lesutis
Participant
@christopherlesutis88732
Hi Erik and Eric,

I will have a look for that book just now. I had noticed the reference to fine feeds on the gearbox but i didnt think it had anything to do with a non screw cutting operation. I thought that fine feeds were for cutting fine threads….

Thanks for all the help!
6 February 2014 at 13:17 #143056
christopher lesutis
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@christopherlesutis88732
Another quick question, has anyone used the backgear for taping? From what I have read the backgear allows for a slower rotation with good torque?
6 February 2014 at 13:28 #143059
Roderick Jenkins
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@roderickjenkins93242
The back gear will give you some low speeds which will make tapping more controllable. The increased torque is immaterial since the major issue you will have is stopping the tap from rotating. Anything over 1/4" or 6mm with a coarse (BSW or metric coarse) thread is quite difficult to tap anyway. I confess that I almost always use a mandrel handle when tapping in the lathe.

cheers,

Rod
6 February 2014 at 13:45 #143066
christopher lesutis
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@christopherlesutis88732
Ahh I see, didn’t think about the issue of the morse taper letting go… Is a mandrel handle something attached to the chuck to stop the tap from rotating in the tailstock?
6 February 2014 at 14:00 #143070
Lambton
Participant
@lambton
Christopher,

As John S has explained the gear box provides ratios for screw cutting and for fine feeds to select either swap round the gear cluster as JS says.

When using the fine feed feature the lever on top of the gearbox can be put into one of three positions Right- Centre- Left that will provide the feed rates shown on the name plate and this lever can be moved from one position to another whilst the lathe is running to suit the job in hand. Not however when screw cutting.

Never move the lower knurled ratio selector whilst the lathe is running.

You can stop the gearbox from working by putting the tumbler gears into neutral i.e. centre position.

If you want to use the lead screw by turning the end wheel (half nuts closed) just put the lever on top of the gearbox into one of the two neutral positions (between the 3 normal positions). The gearbox will still operate but will not rotate the lead screw.

It is all a lot more simple than it sounds you will find the gear box to be a very versatile piece of kit once you have understood exactly how it works.

As I said earlier get the book! You can download a PDF gearbox manual from the net just put Myford gearbox manual into Google.

Eric
6 February 2014 at 14:50 #143071
Roderick Jenkins
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@roderickjenkins93242
Posted by christopher lesutis on 06/02/2014 13:45:18:

Ahh I see, didn’t think about the issue of the morse taper letting go… Is a mandrel handle something attached to the chuck to stop the tap from rotating in the tailstock?

The mandrel handle is just a convenient way to rotate the chuck by hand

If the tap rotates in the drill chuck or tailstock then the alternative is to mount the tap in a conventianal tap holder which is guided by a centre in the tailstock (assuming that the tap holder has a centre hole drilled in the top end). Manipulating this arrangement is a 3 hand job and having a spring centre which keeps axial pressure on the tap wrench is very useful.

Rod

Edited By Roderick Jenkins on 06/02/2014 14:51:33
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