Needs Pictures: 0
Picture(s) thanks: 0
Results 61 to 74 of 74
-
28th Jun 2015, 09:05 PM #61.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 6,459
Neat Ian.
Peter had some very thin cut off discs amongst his collection of grinding wheels. I made the bore of my spanner deep enough to accommodate the additional exposed spindle thread when a thin disc is mounted.
I was very tempted to set the 1 up for some cylindrical grinding this afternoon. I wanted to finish a 55mm length of 4140 to as close as I could get to 15mm. Piked out and resorted to wet and dry wrapped around a file. Another time.
Bob.
-
28th Jun 2015, 09:24 PM #62Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
- Posts
- 114
Bob
It probably wouldn't have the reach to tighten that far as it stands but I could always put it back in the lathe and bore it a little deeper at need.
Regards
Ian
-
28th Jun 2015, 09:30 PM #63Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,562
Or make up a spacer (with appropriate recesses) to go under the existing nut when clamping the disc.
(Someone had tried that with my surface grinder although without the recesses so it did not work all that well)
Michael
-
28th Jun 2015, 11:43 PM #64Senior Member
- Join Date
- Jun 2012
- Location
- ex Perth, now Mittagong
- Posts
- 105
Bob,
A wise move. It is pretty difficult to remove what can be done manually with wet & dry, on a cylindrical grinder, let alone a T&C grinder. You may recall that I had a Myford cylindrical grinder, which had a counterweighted grinding head with in-feed of tenth of a tenth. With coolant and a few thousandth to remove very accurate dimensioning was the norm.
I did do some cylindrical work on the Hercus before the Myford turned up. With a bit of weight hanging from the front of the table to give the lead-screw something to bite on and a 1/10th clock it was still tricky. I found that without coolant on small diameter pieces of any length, very fine passes were required.
All the stars have to line up if you start with only a few tenths to take off!
Peter
-
29th Jun 2015, 11:40 AM #65.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 6,459
Thank you Peter,
It seemed like a poor alternative to be reaching for the carorundum paper when the grinder was sitting there but I thought I'd probably fool around for an hour or so setting things up and probably cock it up anyway. The part I was making didn't require extreme concentric cylindrical accuracy, it's a component of the Schaublin universal vice's stop assembly and the finish was more an appearance thing. At the end of the day it looks and fits OK.
Bob.
-
29th Jun 2015, 12:00 PM #66.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 6,459
Here is a sketch of the dresser bracket Ian.
Let me know if you want a photocopy slipped in the mail. I will probably draw the pulley tomorrow.
Bob.
SKMC36015062908080.pdf
SKMC36015062908010.jpg
-
29th Jun 2015, 02:43 PM #67Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
- Posts
- 114
Bob, Thanks so much, that isn't a sketch its a work of art! It is very generous of you to take the time to do such a careful job. I had better do a decent job of making it up to do justice to the 'sketch'. In a week or so I will be here on my own for a couple of days and that looks like the perfect project for a couple of days of quality shed time.
Regards
Ian
-
29th Jun 2015, 04:02 PM #68.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 6,459
Here's the pulley Ian.
The original is mild steel. The drawing title should read Internal Grinding Attachment. Yellow trace is like tissue paper, you can't make corrections. Sorry.
Bob.
SKMC36015062912440.jpg
SKMC36015062912430.pdf
-
29th Jun 2015, 09:09 PM #69Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
- Posts
- 114
Another wonderful drawing thanks Bob! Interesting that it is made of mild steel, looks like I am on the lookout for a piece of 1" plate or perhaps a hunk of 4" bar might be easier. I wonder if (as it is doing 3K rpm) if it needs to be balanced? Time for some careful thought about how best to machine it up.
Regards
Ian
-
29th Jun 2015, 09:46 PM #70Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,562
Ian, I can probably spare you a short piece of 4" (or there abouts) round to make up a pulley.
As far as balance goes, provided that your machining is concentric it should automatically be in balance. I'd probably make that by boring a hole in the centre and then clamp it up on a mandrel to do the rest.
Michael
-
29th Jun 2015, 10:52 PM #71Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
- Posts
- 114
Thanks for your kind offer Michael! I will send you a PM.
Yes, I thought a mandrell would be the way to go. I have to pull the shaft once more to replace the belts and was wondering about using that as a mandrell?
Regards
Ian
-
30th Jun 2015, 08:16 AM #72Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,562
-
5th Jul 2015, 07:18 PM #73Senior Member
- Join Date
- Feb 2012
- Location
- Willunga
- Posts
- 114
Bob - this is what I have turned your drawing into, the dimensions changed a little as I had to fabricate it but the heights and the angles are as close to the drawing as I can get it.
IMG_0325.jpg
Thanks to Michael G I have the steel to make up the pulley to drive the internal grinding spindle but I think that I will chase up the belt before I have a go at making it up.
Regards
Ian
-
9th Jan 2018, 08:25 PM #74Golden Member
- Join Date
- Jul 2011
- Location
- Adelaide
- Posts
- 837
Glad you posted that little warning about the retaining screw it is 5/16 square headed bolt screwed in from below, once removed you can easily push the shaft from the outside to the inside where you can catch it.
My vertical column lifted out really easily. I am surprised how clean it all is in there given my 3A has grit everywhere.
Similar Threads
-
Hercus Tool and Cutter Grinder
By Geoff123 in forum THE HERCUS AREAReplies: 5Last Post: 28th May 2015, 09:43 AM -
Hercus Tool & Cutter Grinder For Sale in Queensland
By A J in WA in forum THE HERCUS AREAReplies: 0Last Post: 7th Jan 2014, 11:10 PM -
Hercus No.1 Universal Tool & Cutter grinder
By A J in WA in forum THE HERCUS AREAReplies: 3Last Post: 3rd Jan 2014, 01:48 PM -
hercus No.1 tool and cutter grinder
By allterrain50 in forum THE HERCUS AREAReplies: 5Last Post: 29th May 2011, 07:10 PM -
Hercus tool & cutter grinder
By steran50 in forum METALWORK GENERALReplies: 2Last Post: 23rd May 2011, 08:20 PM