Author Topic: Making a cylindrical square - lapping demo.  (Read 336 times)

Offline tonyfoale

  • Jr. Member
  • **
  • Posts: 10
  • Country: es
    • MotoChassis - Source for the chassis design book & software.
Making a cylindrical square - lapping demo.
« on: January 09, 2020, 05:40:03 PM »
I have been an inactive member here for some years but I thought it was about time that I started to post some stuff. 
My first offering is a recent video that I made showing how I lapped an old tailstock from a large lathe into an accurate cylindrical square for inspection and checking of parts that I make.



https://www.youtube.com/watch?v=Crdkp051f-Q

Offline Ed ke6bnl

  • Jr. Member
  • **
  • Posts: 25
  • Country: 00
Re: Making a cylindrical square - lapping demo.
« Reply #1 on: January 17, 2020, 10:06:18 AM »
thanks for the website that is a great channel
1950 Ford F1 streetrod
1968 ecotec powered Baja Bug kink coil overs
1953 Chevy AD ready for 4 cyl. cummins and nv4500

Offline tonyfoale

  • Jr. Member
  • **
  • Posts: 10
  • Country: es
    • MotoChassis - Source for the chassis design book & software.
Re: Making a cylindrical square - lapping demo.
« Reply #2 on: January 17, 2020, 10:20:44 AM »
Ed,

Glad that you like it.

Offline Brass_Machine

  • Administrator
  • Hero Member
  • *****
  • Posts: 5330
  • Country: us
Re: Making a cylindrical square - lapping demo.
« Reply #3 on: January 17, 2020, 11:14:03 PM »
Wait. Wait wait...

Tony Foale???

Like Motorcycle handling and chassis design?

Eric

Very cool video and channel btw!
Science is fun.

We're all mad here. I'm mad. You're mad.

Offline Sea.dog

  • Jr. Member
  • **
  • Posts: 51
  • Country: gb
Re: Making a cylindrical square - lapping demo.
« Reply #4 on: January 18, 2020, 03:51:18 AM »
I knew the name sounded familiar  :Doh:

Offline tonyfoale

  • Jr. Member
  • **
  • Posts: 10
  • Country: es
    • MotoChassis - Source for the chassis design book & software.
Re: Making a cylindrical square - lapping demo.
« Reply #5 on: January 18, 2020, 06:03:21 AM »
Wait. Wait wait...

Tony Foale???

Like Motorcycle handling and chassis design?

Eric

Very cool video and channel btw!

Guilty.  Check out my web site https://motochassis.com

More tools etc at https://www.homemadetools.net/builder/tonyfoale

Offline Pete.

  • Hero Member
  • *****
  • Posts: 995
  • Country: gb
Re: Making a cylindrical square - lapping demo.
« Reply #6 on: January 18, 2020, 07:57:34 AM »
Hi Tony,

I'm a big fan of your work and I love your well-described projects on the home made tools site but this one caught my eye:

https://www.homemadetools.net/homemade-dial-indicator-mount-4

I used to use a similar method for centring stuff horizontally until I took a machine rebuilding course. On the course we were warned never to use this method of rotating a gauge - especially a heavy dial gauge - about a horizontal axis for dialling in a part or tailstock ram etc because the weight of the gauge will tend to bend the supporting bars almost regardless of how sturdy they are, causing the reading to change as the gauge swings full circle.

We were sceptical until he did a demonstration where he put a mag mount on a small surface plate, zeroed the DTI to the plate. He flipped the whole assembly over and the DTI moved nearly 10 thou. If you used that example setup to centre a part it would be 5 thou low but read zero all around.

It was plainly obvious once demonstrated but up until that point I was blissfully unaware of the issue.