Measuring a complex part without a surface plate

[stevec]

Tom, my wife thinks I'm as dense as granite!

[kenne]

(07-22-2014, 02:33 PM)stevec Wrote: Tom, my wife thinks I'm as dense as granite!

I wonder is that a machinist trait or a wife trait , mine said the same about me ?

[Mayhem]

Well today I measured the 2 areas that were visibly different between the original part and the one that Ken made for me. Ken's part was as per the print that Kondia sent me (dated 1973). My mill has been estimated to be from 1969 or 1970, although this hasn't been confirmed.

Today Kondia sent me the print for the quill stop micrometer screw, so I could locate the missing hole and drill it. My only concern now is whether or not this part changed, as the print is dated 1976. I'm hopeful that I'll be OK. Although I now need to buy a 6.5mm reamer, as I'm sure the hole has to be fairly accurate. However, all that appears next to the dimension is "al montaje", which Google tells me is Spanish for "assembly". It is hand written, so I could be reading it wrong but no other combination of possible letters produced anything legible.

[PixMan]

I feel better now that you've confirmed the work I did was right to the print, Darren. Just as I'm sure you feel, I wish they'd sent the correct print. Have you pinged them to see if they have an earlier version of it on file somewhere?

If you can't get one perhaps you can mark up the print I did work from so we can start a new one. I could make it and get it out to you within a week or two as my plate is empty and with some family issues that have cropped up (daughter), I can't spend any time on my bike and am often at my mom's home where the shop is located.

[Mayhem]

I've emailed them and waiting to hear back.

I'll take some measurements but given that I would hate to balls that up, I may just take your initial advice and post you the busted one.

[krv3000]

hi to a flat surface toughened glass IE a flat side window out of a van or even a old oven glass dore or even them new fangeld digital scales you have in the bathe room

[Mayhem]

OK - well Kondia got back to me and said that is the only print they have on file for that part.

I had a thought on how to accurately measure the hub and I think it worked out OK. I bolted the part to one of my 1-2-3 blocks and then used gauge blocks to measure the distance between the two surfaces. Stupidly however, I have left the bit of paper with the measurements written on it in the shop

To measure the counterbore, I used the table of my drill press and a dial indicator mounted to a rack and pinion adjustment screw that was salvaged when a lab at the uni was having a 'throw out'! I had no luck however, as I couldn't get consistent readings on the DI. I think it needs a service, as I couldn't get it to repeat its zero point.

Here is a picture of that set up:

   

Bob - I had thought of using glass and I also got a lump of granite bench top given to me. However, that feels quite rough to the touch.