Myford Super 7 - Adding Power Cross Feed

I am thinking of adding power cross feed to my Super 7B.

Does anyone have any experience of the device that was made by WMED? Is it any good?

Does anyone know of any other commercial products that were, or are available, that they recommend?

Does anyone know of any articles that have been published for a DIY system that they can recommend?

I do not really need CNC control, but if a product/design has this and allows a speed controllable power crossfeed, then that is no problem.

Thanks in advance for your inputs

I've got one:

I've had it for 25 years or so. Brilliant bit of kit - I wouldn't be without it. The drive appears to be via a pair of bevel gears but I assume that there is also a gearbox on the end of the motor. The control box governs speed and direction so I assume the motor is a 12 V (?) dc unit. I noticed that Maplin have some low voltage motors with built in gearboxes - might provide the basis for a home brewed version.

HTH

Rod

theres one on ebay for sale

http://tinyurl.com/nsow87z

Z

Edited By Ziggar on 06/02/2014 23:10:01

Hi All,

I actually bought this unit off ebay, which Ziggar is referring to. But it has got an issue. When there is a little bit force on the crew that turns, the gear slips. When I took it apart it appeared that the conical gear on the top is a bit worn out (it is from nylon I think). Does anybody know if there is a spare part out there for this power cross feed?

Thanks for your help!

Kind regards, Joost

Can you adapt this to fit ?? http://mikesworkshop.weebly.com/cross-slide-motor.html

Hi John,

yes that seems like a solution for the problem. Maybe I can do that. Thanks a lot for your fast reply!

kr Joost

John,

Thanks for sharing your idea's. What a great inspirational website you have. You've got me thinking of all sorts of modifications now!!

Paul`

Why does anyone need a power cross feed on a Myford?

A battery drill is good for fast return.

.

To achieve a smoother finish than they can get by hand cranking.

MichaelG.

Not very often, I use it when facing larger diameter brass (>80mm), you do not have to stand in the hale of swarf you are producing. Niko.

Edited By speelwerk on 04/06/2014 16:37:02

The reason I developed the power feed for the cross slide on my mini-lathe ( the one referred to in John's post) was because I had been turning 150 mm barbell weights. If the tool is advanced too quickly it was very easy to stall the lathe and blow a fuse. Each pass took a long time by hand and human nature demanded that every effort was made to go as fast as possible which meant that there was always the danger of a stall and blown fuse.

The power feed makes this sort of job much easier because of the constant feed speed can be set to give a good rate of cut with little danger of stalling.

It is also very good for any sort of facing operation where a good finish is required. The speed can be set really slow and near mirror finish is possible on some steels.

Mike ( of mikesworkshop.weebly)

Hi All,

I tried the solution from john kennedy 1, but it appeared that the problem of the power cross feed was much more down in the device. See the picture...

The gear that is missing in the picture has one broken tooth. See below:

The diameter is 12.31mm or in inches:

The gear has 30 teeth, and the hole in the middle is 2mm. I tried to find one but without succes sofar. I contacted HPC gears today, so will see if they have one.

KR, Joost

I have one as well - never managed to find any info on it, so thanks for the above - but with a £250 sale price on the 'bay I might not have it that much longer

It's very compact, it disengages completely leaving direct manual control, and I find it very useful for good quality final facing cuts. It's not very powerful, but for final cuts it's fine. It's also somewhat bent somewhere - the cross slide screw is true but something's skew outboard of the micrometer dial and there's a fair amount of "wobble" on the handle when running or on manual use. I haven't tracked down the problem.

I did take mine apart with a view of substituting the electronics and somewhat weak motor with an equivalent plus a stepper motor and noticed that my conical gear seems in good condition - but it's mine, you can't have it, sorry

Quote: but it's mine, you can't have it, sorry

Why not? It is only one small plastic gear!

Ok will sent it to HPC and they will see if they can make one.....

Hi, on instructibles.com website under heading of broken gear repair is a step by step description of repairing a gear with missing teeth, cannot find a way of inserting a link to the site. HTH

.

Would this be the one, Chris ?

That's a useful reference, thanks.

MichaelG.

Mmm that looks like a quick, cheap and easy fix.....

Too bad I already sent it to HPC gears.....

Homebrew ML7 power feed for less than 50 squid

Add parting to why would you want a power cross feed

Why does anyone need a power cross feed on a Myford?

Apart from anything else have you ever tried taking a truing cut across the faceplate? I was very glad of the PCF when I did so a while ago!

N