22mm crossette press
Moderators: richardh08, Boophoenix, Lloyd
22mm crossette press
This is just "braggin'", but here's a pic of how nicely-fitted brass liners look in an aluminum mold.
As you can see, there are no visible gaps. They're also threaded into their holes, and Loc-Tite'd in. If removal is necessary, the mold can be heated, and there is a hex machined on the bottom end of each liner, so that it can be removed with a socket wrench.
Lloyd
As you can see, there are no visible gaps. They're also threaded into their holes, and Loc-Tite'd in. If removal is necessary, the mold can be heated, and there is a hex machined on the bottom end of each liner, so that it can be removed with a socket wrench.
Lloyd
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"Pyro for Fun and Profit for More Than Sixty Years"
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Re: 22mm crossette press
That`s a beautiful piece of work Lloyd....I`m drooling
- richardh08
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Re: 22mm crossette press
That's an enviably impressive example of precision machining!
Even when I'm wrong, I'm convincing.
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Re: 22mm crossette press
That sure looks like several thousands $ of work to me! I saw some plastics molds today that were $600k I never realized how expensive fine machining could be.
Tom
Tom
Re: 22mm crossette press
"...I never realized how expensive fine machining could be."
000000000
Yeah... basically double the precision, quadruple the price. 'The rule of squares'!
Lloyd
000000000
Yeah... basically double the precision, quadruple the price. 'The rule of squares'!
Lloyd
"Pyro for Fun and Profit for More Than Sixty Years"
Re: 22mm crossette press
Lloyd can you give an insight on to how the correct amount of composition is loaded in to the press I have an idea but I am not sure.
Re: 22mm crossette press
Ken,
Both the top and bottom platens have DROs (digital readouts, for non-machinists) so that they may be raised and lowered to precise heights.
The top plate's DRO is only for the purpose of establishing a selected 'pressing zone' in the mold, such that wear-out of the cavity liners can be extended to about 3X what one would obtain if only a single pressing zone were used.
However, the bottom plate's DRO is used to establish fill height.
During setup and initial testing, 'zero' is set when the bottom pins are exactly flush with the top of the cavity plate.
Then pressing adjustments are made by selecting various depths (as read on the DRO), until the proper comet length is obtained.
THEN, that particular depth setting is re-set as 'zero'.
For filling, the operator simply lowers the bottom pins to 'zero' on the DRO, then fills the cavities by dumping and squeegee.
Lloyd
Both the top and bottom platens have DROs (digital readouts, for non-machinists) so that they may be raised and lowered to precise heights.
The top plate's DRO is only for the purpose of establishing a selected 'pressing zone' in the mold, such that wear-out of the cavity liners can be extended to about 3X what one would obtain if only a single pressing zone were used.
However, the bottom plate's DRO is used to establish fill height.
During setup and initial testing, 'zero' is set when the bottom pins are exactly flush with the top of the cavity plate.
Then pressing adjustments are made by selecting various depths (as read on the DRO), until the proper comet length is obtained.
THEN, that particular depth setting is re-set as 'zero'.
For filling, the operator simply lowers the bottom pins to 'zero' on the DRO, then fills the cavities by dumping and squeegee.
Lloyd
"Pyro for Fun and Profit for More Than Sixty Years"
Re: 22mm crossette press
OK Lloyd yes I see how it works now and I must admit that the concept is rather good hats off to you, my calculations from dollars to pounds makes this press very affordable well done.
Re: 22mm crossette press
basically that sounds like a volumetric fill.
this method is widely used on any tablet machine, single punch or rotary, where the fill weight is adjusted by lowering or raising the bottom punch, and the hardness of the tablet is adjusted by the depth the top punch penetration into the filled die.
a similar but slightly different method is used for filling capsules, but again its still volumetric to get the weight.
this method is widely used on any tablet machine, single punch or rotary, where the fill weight is adjusted by lowering or raising the bottom punch, and the hardness of the tablet is adjusted by the depth the top punch penetration into the filled die.
a similar but slightly different method is used for filling capsules, but again its still volumetric to get the weight.
Re: 22mm crossette press
Well yes it is, but when I was in the WECO factory some years back a different technique was used, but I can see your point pill manufacturing works just the same.
Re: 22mm crossette press
Dave321 said,
"...this method is widely used on any tablet machine, single punch or rotary, where the fill weight is adjusted by lowering or raising the bottom punch, and the hardness of the tablet is adjusted by the depth the top punch penetration into the filled die."
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Exactly so, Dave. And having had experience (in pyro) with both single-station and rotary tabletting equipment was part of what led to this DRO strategy. We (Santore) owned two older Stokes rotary tablet presses for making 'dry' stars, ready to prime and use.
However, volumetric fill has pretty much been the 'way' with multi-cavity comet presses since the dawn of pyro time, so this was just a refinement to allow easy user control over the fill volume.
Lloyd
"...this method is widely used on any tablet machine, single punch or rotary, where the fill weight is adjusted by lowering or raising the bottom punch, and the hardness of the tablet is adjusted by the depth the top punch penetration into the filled die."
------------------
Exactly so, Dave. And having had experience (in pyro) with both single-station and rotary tabletting equipment was part of what led to this DRO strategy. We (Santore) owned two older Stokes rotary tablet presses for making 'dry' stars, ready to prime and use.
However, volumetric fill has pretty much been the 'way' with multi-cavity comet presses since the dawn of pyro time, so this was just a refinement to allow easy user control over the fill volume.
Lloyd
"Pyro for Fun and Profit for More Than Sixty Years"