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#89291 20/12/17 08:18 AM
Joined: Jan 2016
Posts: 8,087
Likes: 222
SENIOR TECHNICIAN
BB any thoughts on this machine. What does a back lap usually cost for a cylinder mower
https://www.ebay.com.au/itm/Cylinder-Mower-Backlap-Machine/202149520269?

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Last edited by CyberJack; 21/12/17 10:54 PM.
Joined: Aug 2011
Posts: 2,998
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Former Moderator
Hi Norm,

Nice looking piece of kit I must admit.

Have to say it's probably a bit pricey for what it really is and would only pay its way if you were using it as part of a business, but not as an owner user. As far as what it costs I don't even know anyone that does it as part of their businesses. They just do straight grinds and reassembly of the machine.

Back lapping is one of those things that many owners do themselves on their own machines by utilising the compounds that are available on eBay.

Sorry I can't be of more assistance on this topic Norm.

Cheers,
BB.


I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.
Joined: May 2017
Posts: 131
Apprentice level 2
I've seen regrind prices from $80-120, but everyone usually backlaps themselves with drills etc.

Joined: May 2017
Posts: 131
Apprentice level 2
Here's the one i used at my local bowling club


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Former Moderator
Hi Millzy and Norm,

I forgot to add using larger electric drills is the done way of providing the reverse drive in the domestic environment.


Cheers,
BB.


I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.
Joined: Nov 2013
Posts: 6,938
Likes: 304
Forum Historian
Quote
I forgot to add using larger electric drills is the done way of providing the reverse drive in the domestic environment.
Hello Mod BB, Millzy and Norm ... and all
Thanks Norm for raising this topic.

Yes, a domestic drill with a suitable connector is fine.
But the drill must be capable of low rpms!
Also consider a manual Brace tool - nothing wrong with that!

The grinding paste must be able to do its job.
Higher rpms merely throw the paste centrifugally outwards, sometimes amusingly so.
We don't want Jackson Pollock results here! smile

In the old days, back-lapping was all manual (see below).
The reel was rotated by hand, usually on a jig (for the smaller mowers).
In the 19th Century 'Lavender Paste' was used.
This was replaced by graphite compounds in the 20th century.

Slow is the way to go for great results.

Back-lapping should be conducted regularly (at least once a season).
Back-lapping is not a procedure that can be effective with poorly maintained machines.
The only option, then, is re-grinding of reel, and grinding (or replacement) of the bedknife.

[1] Back-lapping involves the reel operating in reverse.
[2] The reel must make slight contact with the bottom blade (bedknife).
[3] After the lapping, all paste needs to be washed-off!
[4] Checking results should be made via the 'paper-test method'
[5] The machine should not be run with any trace of grinding paste.
[6] Only water-based grinding compounds should be used.

Hope this helps
-----------------------------------
Jack

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