Product category:
Honing, polishing, burnishing and lapping
News Release from: Kenrie | Subject: Correct abrasive length in honing
Edited by the Manufacturingtalk Editorial
Team on 01 September 2006
Determining correct abrasive length in
honing
In comparing standard honing and 'blind' honing, a short article shows how a machine shop can determine which is the right abrasive length.
For standard honing it has been determined that for most honing applications between 1/4 to 1/3 of the abrasive length passes beyond the end of the bore and that the part of the abrasive which remains in the bore should not extend beyond the center This provides the basis for choosing an abrasive length
This article was originally published on Manufacturingtalk on 11 Jan 2007 at 8.00am (UK)
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Half of the bore length plus 1/3 of that amount produces an abrasive length which will be at the center of the bore when 25% of the abrasive length extends beyond the bore.
This system, in conjunction with the different lengths which are available, lead to the final selection.
There is nothing magic about blind end bores which excludes them from this same line of reasoning, except that the mental gymnastics are somewhat reversed.
We start out with a given amount of relief and work backwards.
For an example, if a 1.1/2in long bore happened to be a blind end bore with 1/8in relief, we would multiply that length by 4 to get the appropriate length.
However, some 'Fudge"'factors can be incorporated.
The machine can be set to hesitate or 'dwell' slightly at the bottom of each stroke, this permits us to multiply the length by 5, so the abrasive can be 5/8in long.
Oftentimes, some restriction at the blind end is permissible, so the abrasive can be lengthened accordingly.
If the bore should happen to be longer so that the entire length of the abrasive was subject to more wear, to straighten itself each stroke, a longer abrasive could be considered.
It just is not practical to lay down hard and fast rules in this area because of the specific circumstances which affect the final decision.
When diameter sizes under consideration are large enough to use tools with stone and shell assemblies, it is possible to be more aggressive with stone length because it is a simple matter to mount a shorter stone at the lower end of the shell to reduce the restriction at the blind end if it is beyond the acceptable tolerances.
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