Thread: Myford Bed Regrinding

Originally Posted by DSEL74

26-50mm Mic. No I don't have either inside Mic or gauges. I do have a DTI but not sure how you are thinking to use it?

I was thinking along the lines of these pictures. Thinking more about it, while the DTI might be nice for a quick check along the way, I think it would be nice to start with some real(or close to real) numbers.
How wide is the slot between the flat ways?
My reasoning for measuring the slot instead of bed width is I assume the slot will have little wear at each end(that and I dont have a mic big enough to measure the bed width anyway.

Stuart

Sorry Stu, I'm still not sure how you are taking comparative readings. If your reference surface is the top of the way how do you move it along in reference to the perpendicular face??

It just sits on the top, it references off the face using the pins that stick out of the base. they are up in the first picture and down in the second.

Stuart

Originally Posted by Stustoys

It just sits on the top, it references off the face using the pins that stick out of the base. they are up in the first picture and down in the second.

Stuart

Ahh ok I don't know if mine has pins. Something else to look at. Always learning something new.

Originally Posted by Stustoys

How wide is the slot between the flat ways?

*cough*

Nasty cough you have there Stuart.... I hope you get better soon

Originally Posted by AndrewOC

There is this company, in Mona Vale, (northern Sydney); http://www.mtasupport.com.au/index.html
I remember them as Hardwick & Tatam.
regs,
AndrewOC

MTA (Machine Tool Automation, the updated name for Hardwick and Tatam) is one of the long established Sydney machine tool rebuilding firms that is still going. There is (was?) also Grout and Darlington but since the auction of slideway grinders etc at Smithfield last week (different company name but I think related to Grout & Darlington) I do not know if that business is continuing.

Back on topic, it happens that I just got a quote from John Tatam for regrinding the bed of my Chipmaster, which with a bed length of 1100mm is quite a bit bigger than a Myford. I am delivering the stripped down bed to him. Quote is less than $500, which I think is excellent value. Besides which you get a trip to the beach.


Cheers,
Bill

Well that's a pity, my inside mics wont fit.

I'll give you a pm/call in the next couple of days and we'll get some measuring done.

Stuart

What about if we did the set up as you showed in your pics but had the Mic touching the opposite way edge? I'll be smithing Wed but otherwise free.

yeah we'll likely do that as well.
Its hit the fan around here. I'll try for Thursday but can't promise anything.

Stuart

Ok so the idea is, to scrap the front and back of the bed to make the lathe usable, staying on the waste side of the line so if Dale should give up or decide at a later date to get it ground.....nothing other than time and blue is wasted.
So with that in mind the plan is to assume the right hand end of the bed is unworn and as it left the factory and that the wear on the slot is even front and back. That means there is 0.02mm wear at the head stock end, split that to the front and back. Gives you 44.390mm and 34.96mm. Scrape a small area on the right hand end to that depth. Use a straight edge or plate to join the two ends with a straight line.
Should be good to go (Yes, not perfect but at least it should work better than it does ATM, only removing metal that would have been removed by grinding anyway)

The thickness/flatness of the bed and the width of the tailstock slot wont be touched ATM(I didn't clock for minimum thickness, maybe I should have).

Nuts?
Have I missed some thing?

Stuart

I pulled the lathe down and with a bit of help from Stustoys & his bunnax? followed by my hand scraping we managed to remove both the taper and concavity from the front way. After assembly it was much improved but still a little tight right up towards the tailstock. A slight backing off of one of the saddle clamp screws and she seems quite serviceable for now.

So I will fully reassemble her and put it back into service as see how she fairs on a few non critical turning jobs and reassess from their if further scraping is required or it needs a proper regrind. I've made notes of the recommendations on that for future use. Thanks everyone for your input getting me this far.